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"Listen close- urgh, I have important- urgh! This is why I can't take you nice places!" In V4.20, the jungle received a complete overhaul from both jungle camp statistics to jungle items. Please be aware that not all of the info on this page may have been updated. |
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Monster camp locations on Summoner's Rift.
Jungling is considered a position much like the lanes involving killing neutral "Monsters" located on the maps between the lanes. Junglers dedicate themselves to the farm available in the Jungle. Jungle refers to any area of the map that is not a lane or part of either team's base, including the river that divides it.
Jungling is a role limited to Summoner's Rift, and to a lesser extent the Twisted Treeline, which is limited and not as major a part of team strategy due to the small size of the map and the jungle providing less consistent farm.
Monsters
A Monster is a particular classification of unit. Unlike Minions, Monsters are neutral (they do not fight for either team), have a level based on the average champion level, and will not automatically attack a champion unless they are attacked. As their level goes up, so does their reward gold and exp along with their damage and survivability stats. The table in Jungling Overview goes into greater detail. With the exception of boss Monsters, Monsters do not increase in level (stats) until after they have re-spawned. Certain monsters offer greater rewards, like a buff or a "global" reward. Some of the buffs granted are transferable to enemy killer champions. Monsters will not move from their designated camp until attacked, in which case the monster will move towards and attack the nearest champion, up to a certain distance from its spawning point ("leash" distance); if the monster is unable to attack any target or reaches its leash range, it will walk back to its original spawn point, rapidly regenerating to its full health. If attacked on its way back, it tries again to attack a champion. Since monsters attack the nearest champion, they can select a new target after having attacked. There is an internal counter for these target changes, and after having changed targets 10 times, a monster will return to its spawning point even if attacked, regenerating its full health at a high rate.
As monsters will always attack the nearest champion, a long ranged attack on a monster can allow you to detect the presence of enemy champions out of sight.
Monsters will not immediately "forget" champions that hide in bushes, and try to walk into the bush to attack. A monster that can see a champion provides vision of this champion to all of the monsters in its camp.
If a champion is killed by a Monster, both teams are notified with the announcer stating "Executed" and text indicating which champion and what Monster killed him.
Technically, when hit, monsters will attack the closest targetable opponent, which can be a minion. Minions do not retaliate against monsters. Minions killed by monsters does not grant gold.
Basis of Jungling
The primary reason for Jungling is resource allocation. The jungle offers a lot of gold and experience that can be accessed through slaying the monsters that spawn and respawn in predetermined locations on the map. With a lone player dedicating himself to accruing it, it leaves two solo lanes available to both gain high experience and gold rather than only one solo lane. In effect, all accessible resources are being utilized by a team with a jungler.
There are other important tasks that a jungler is able to perform, due to their roaming nature preventing enemy champions from spotting the jungler through the fog of war. This allows for unexpected positioning and surprise attacks, mainly through the use of ganks. Their ability to freely traverse the map without being tied to a lane also allows them to support lanes when in the area, such as warding key locations without forcing someone else to abandon their lane and coming to an ally's aid when they come under duress.
The final reason for Jungling is the security of the two epic monsters on the map, 
Baron Nashor and the . Because of the potentially game-turning advantages these two monsters can give to a team that successfully kills them, it is often a responsibility of the jungler to ensure that these camps are not acquired by a marauding enemy team by using 
Smite to secure or steal the camp at the last second.
Jungle Overview
On Summoner's Rift there are 14 monster camps: blue and red jungles have an equal area with the same amount of non-boss monsters. The jungle is effectively perfectly rotationally symmetrical around the center of the map, with the exceptions of the boss monsters and Baron Nashor, who are unique and reside in sheltered alcoves along the river (Baron Nashor is on red team's side of the river and the Dragon is on the blue).
On the Twisted Treeline, there are 7 camps, being symmetrical about the center of the map with the topmost camp hosting the sole boss monster 
Vilemaw.
This table lists the initial statistics each monster grants, or the value of gold and experience granted when the monsters are at level 1 (6 for the ). Over time the monsters will grant additional rewards; monsters will level up after having been killed, except Dragon, Baron, and Vilemaw, who will level throughout the game. Check the individual monster pages to see these level up values.
| Camp | Initial Rewards | Health | Resistances | Initial Spawn | Respawn Time |
|---|---|---|---|---|---|
| +41 Gold; +140 EXP | 1200 | Ar:15; MR:0 | 1:55 | 1:40 | |
| x3 | +9 Gold; +20 EXP | 250 | Ar:5 MR:0 | 1:55 | 1:40 |
| +42 Gold; +142 EXP | 1320 | Ar:9; MR:0 | 1:55 | 1:40 | |
| x2 | +12 Gold; +30 EXP | 420 | Ar:6; MR:0 | 1:55 | 1:40 |
| +60 Gold; +150 EXP | 1440 | Ar:12; MR:-10 | 1:55 | 1:40 | |
| +14 Gold; +50 EXP | 540 | Ar:12; MR:-10 | 1:55 | 1:40 | |
| +62 Gold; +200 EXP | 1600 | Ar:15; MR:0 | 1:55 | 1:40 | |
| +35 Gold; +35 EXP | 750 | Ar:60; MR:60 | 2:30 | 3:00 | |
+36 Gold; +100 EXP; Crest of Insight |
2000 | Ar:20; MR:0 | 1:55 | 5:00 | |
| x2 | +20 Gold; +50 EXP | 400 | Ar:8; MR:0 | 1:55 | 5:00 |
+36 Gold; +100 EXP; Crest of Cinders |
1800 | Ar:20; MR:0 | 1:55 | 5:00 | |
| x2 | +20 Gold; + 50 EXP | 400 | Ar:8; MR:0 | 1:55 | 5:00 |
| +25 Gold; +75 EXP to the killer and nearby allies; 1 stack of  Dragon Slayer to all teammates
|
4940 | Ar:21; MR:30 | 2:30 | 6:00 | |
| Baron Nashor
|
+25 Gold and +300 Gold to all teammates; +900 EXP all teammates; Hand of Baron to all living teammates
|
8800 | Ar:120; MR:70 | 20:00 | 7:00 |
| Camp | Initial Rewards | Health | Resistances | Initial Spawn | Respawn Time |
|---|---|---|---|---|---|
| +33 Gold; +120 EXP | 1000 | Ar:15; MR:0 | 1:40 | 0:50 | |
| x2 | +18 Gold; +48 EXP | 350 | Ar:8 MR:0 | 1:40 | 0:50 |
| +28 Gold; +144 EXP | 1150 | Ar:9; MR:0 | 1:40 | 0:50 | |
 Wolf x2 |
+12 Gold; +14 EXP | 400 | Ar:6; MR:0 | 1:40 | 0:50 |
| +48 Gold; +150 EXP | 1250 | Ar:12; MR:0 | 1:40 | 0:50 | |
| +38 Gold; +42 EXP | 500 | Ar:12; MR:0 | 1:40 | 0:50 | |
| Vilemaw |
+190 Gold; +? EXP to all teammates; Crest of Crushing Wrath to all living teammates
|
5011 | Ar:35; MR:30 | 10:00 | 5:00 |
All jungle monsters (with the exception of Baron Nashor) will grant modified experience points if the level of the champion killing them differs from than that of the monster. The modifier caps out at 350% for champions 5 levels or more below the camp's level and bottoms out at 50% for champions 5 levels above.
Respawn timers on the camps do not begin to count down until all monsters in the camp have been killed, including the major buff camps. This can be exploited by a jungler looking to steal his opponent's experience by leaving a single minor monster behind to deny the enemy jungler his farm and experience for as long as possible.
Champions of the Jungle
The champions who regularly are seen in the jungle role often tend to be categorized with one another to show that many champions will use the same overarching playstyle. Some champions can belong in more than one category, although such champions often tend to be worse at either role than dedicated champions of only one type. Knowledge of which group(s) a given champion belongs in can go a long way in predicting how that champion will build and behave in a match.
It should be noted that such categorizations show only how the champion is likely to act as a jungler, and are often distinct from how the champion is likely to act as a pick.
There are generally agreed to be three recognized types of jungler in League of Legends:
A ganking jungler aims to contribute to his team by providing constant pressure to enemy laners and setting up kills for their allies, allowing them to snowball their way to victory even as the ganker jungler falls behind in gold due to generally low farm. Such junglers often tend to prioritize heavy crowd control and mobility in their kit, which allows them to reach even the most heavily-entrenched laners and lock them down long enough to ensure their demise.
Ganker junglers tend to be good picks against farming junglers, as without the need to worry about an opponent intercepting a gank attempt they can freely roam and harass opposing laners with no fear of reprisal.
Examples of ganking junglers include 
Jarvan IV and 
Nautilus.
A farming jungler does what their title implies - they spend the vast majority of their time farming the camps that respawn in the jungle, and will also often supplement this income by entering an ally's lane and farming enemy minions as well. This type of jungler sacrifices aiding their laners in the early game with the intent of getting large amounts of gold and levels to become a significant threat in the late game, and often boast very high damage output and strong scaling, allowing them to farm the jungle at maximum speed and effectively become a second carry if they are allowed to farm for long enough.
Farmer junglers tend to resist control junglers, who more often than not will simply not be able to steal camps at a rate that is able to compete with the high clearing speed of their opponent and usually end up outscaled by their better farmed opponent.
Control junglers are aimed specifically at defeating other junglers and ensuring that they have as little influence as possible through the course of a game, and assist their allies mainly though use of objective control, such as using early takedowns of the and the two major buff camps on both sides. This type of jungler can be very varied in their design but most of them will prioritize sustainability or dueling potential as their key stats, allowing them to defeat other junglers through both attrition and raw power if needs be.
Control junglers are counterpicks to ganking junglers, as their stalking nature allows them to nullify their opponent's strengths by ensuring their ganks do not succeed, as well as crippling what little farm they already get.
Runes and Masteries
There are a few common setups used to increase a jungler's potential:
Seals
Greater Seal of Armor (+1 armor)
These seals are more or less mandatory on any jungler as they sharply reduce the damage taken from neutral creeps, resulting in higher end health and opening more options for their next move.
Marks
- Greater Mark of Armor Penetration (+1.28 armor penetration)
- Greater Mark of Attack Damage (+0.95 attack damage)
- Greater Mark of Attack Speed (+1.67% attack speed)
The choice of marks generally aims to increase the jungler's offensive prowess and improve their clearing speeds. Even champions whose playstyles and builds do not especially benefit from any of these will still usually take marks of attack speed to make the most use of the Maim passive of 
Hunter's Machete, as marks provide only marginal bonuses to non-autoattack related statistics.
Glyphs
- Greater Glyph of Scaling Magic Resist (+3 magic resistance at Level 18)
- Greater Glyph of Scaling Cooldown Reduction (+1.67% cooldown reduction at Level 18)
- Greater Glyph of Ability Power (+1.19 ability power).
Glyph choices are usually aimed at augmenting the later stages of the game for the jungler. Magic resistance per level is the usual choice as it allows many junglers to purchase armor for their duties without needing to worry too much about magic damage. Cooldown reduction per level glyphs are instead for the few champions who have very long cooldowns and do not intend to incorporate lots of cooldown reduction items into their build. Ability power glyphs are for mage junglers whose primary clearing abilities scale with this stat.
Quintessences
- Greater Quintessence of Movement Speed (+1.5% movement speed)
- Greater Quintessence of Life steal (+1.5% life steal)
- Greater Quintessence of Attack Damage (+2.25 attack damage)
- Greater Quintessence of Attack Speed (+4.5% attack speed)
- Greater Quintessence of Ability Power (+4.95 ability power)
Quintessences function as wild cards and can provide any kind of benefit the jungler wishes. Movement speed is extremely common and offers large improvements to ganking potential, while other rune types are usually aimed at improving the speed or sustain of the jungler instead.
Masteries
- Butcher - Basic attacks and single target abilities deal 2 bonus damage to minions and monsters.
- Feast - Killing a unit restores 3 health and 1 mana.
- Tough Skin - Reduces damage taken from monsters by 1 / 2.
- Bladed Armor - Attacking enemy monsters are inflicted with a bleed for 2 seconds that deals 1% of their current health in physical damage per second (therefore it can apply Spirit of the Elder Lizard's Incinerate).
- Fleet of Foot - Grants 0.5 / 1 / 1.5% movement speed.
- Runic Affinity - Increases the duration of all neutral buffs (with the exception of Exalted with Baron Nashor) by 20%.
Items for Jungling
Jungler itemization has gone through some considerable changes over the course of League of Legends' lifespan, maining owing to the unique difficulty in balancing a relatively unorthodox role with the more traditional laning positions.
During Season One, the jungle was a highly profitable source of gold, so much so that often a Jungling champion could even obtain more farm than the lanes with some effort, eventually letting them afford expensive and deadly items if their farming efforts were not halted. This was offset by the enormous difficulty of the jungle monsters of the time - there were extremely few junglers who could even clear effectively in such an rigorous environment and even fewer junglers who could begin the game with anything other than a 
Cloth Armor and 5 
Health Potions.
The jungle rework of Season Two reduced the difficulty of the jungle monsters and the gold and experience that they gave out in an attempt to open the jungle to more prospective champions. Despite the decreased monster health, however, it was found that the decreased gold meant that dedicated farming was simply no longer an economically viable strategy, and many junglers were forced to find alternative solutions to the resultant gold starvation (most often amounting to early stacking of gold generating items such as 
Philosopher's Stone and 
Heart of Gold), while other junglers whose core item builds often demanded a high gold income to be feasible simply could not function in such a low-gold environment.
The jungle in Season Three attempted to compromise between the high farm of Season One and the low difficulty of Season Two. The introduction of Hunter's Machete allowed many junglers to successfully clear without many sustain issues and offered fallback solutions in the form of the highly gold efficient items it built into in case of a poor early game, and the increase to passive gold generation saw most junglers in possession of at least passable amounts of gold. These changes saw the number of viable junglers increase greatly.
The current iteration of Season Four was built upon the framework set by Season Three, with several gameplay refinements aimed at combating issues seen at higher levels of play. Of particular note, all of the high-tier jungle items now provide benefits exclusively involving killing monsters and an entirely new jungle monster, the Gromp, was introduced, enabling much higher potential profits to both farming junglers who are sufficiently fast to keep up with the respawn times of the four camps and ganking junglers who do not perform well early on. These buffs to farming junglers were boosted further with the addition of 
Feral Flare, which provides massive bonuses to junglers who can farm fast enough to acquire the upgrade early on. On the flipside, the addition of 
Quill Coat has kept slower utility junglers useful during a metagame period dominated by heavy early offense.
The most common setup when starting a jungle game is a Hunter's Machete and 4 Health Potions. This setup improves jungle clearing speed, provides 600 bonus health to cover early health losses and has the most flexible build path options. Junglers that intend to play an extremely aggressive early game can be seen to start with a 
Doran's Blade and a Health Potion instead in order to maximize their offensive capabilities. This is most commonly seen on champions who have some form of resistance to damage or are just fast and sustained enough that the decreased health never becomes a factor, such as 
Shaco and 
Udyr.
A fair majority of champions who purchase Hunter's Machete will typically upgrade it into a 
Spirit Stone, which has health and mana restoration from attacking monster camps, a percentage bonus damage boost to aid general clearing and two useful upgrades which grant large offensive boosts. Autoattack-based junglers who intend to bolster their clear times as much as possible and maximize their lategame contributions will usually upgrade Hunter's Machete into 
Madred's Razors and 
Wriggle's Lantern for their large magic damage procs and gold boosts, eventually aiming for an early Feral Flare for a significant power spike and the ability to become stronger over time by racking up kills and assists. Particularly fast junglers who attempt to rush a Feral Flare as soon as possible may even get both Spirit Stone and Wriggle's Lantern at once. This leads to incredible clearing speeds but somewhat reduced combat capacity.
Slow-clearing junglers who also wish to opt for a tankier route will usually upgrade into Quill Coat, an item that smooths clearing experiences for these champions while maintaining a reasonable level of sustain, as well as upgrading into a powerful lategame item in the form of 
Spirit of the Ancient Golem.
As the jungler is often expected to spend a large amount of time roaming the map between camps and lanes, 
Boots of Mobility are a useful purchase to lessen the considerable travel time and maximize team contributions. If Boots of Mobility are not required or priority goes towards counterbuilding against the opposing team, then the other boot options such as 
Mercury's Treads or 
Ninja Tabi are viable alternatives.
Common Jungle Routes
A jungle route is the order in which a Jungling champion will tackle each of the camps scattered around the map during their very first clear. Routes tend to vary from very offensive to very passive, depending on the playstyle of the jungler in question (though certain champions are more efficient with some routes than others). Regardless of how aggressive the route is, each route is optimized to provide the jungler with the best balance of health and time invested - crucial during the earliest stages of a game where many junglers are at their weakest and most vulnerable states.
End level: 2
Route:
- camp ( Smite)
- Gank a nearby lane.
This extremely aggressive jungle route is the riskiest out of all jungle routes and is most often used in an attempt to obtain the First Blood bonus before opponents have had a chance to acquire all of their spells yet. On some junglers, this also sacrifices some potential at farming for early increased offensive prowess.
Failure to acquire a kill can often leave the jungler dangerously behind on experience and farm and will leave them vulnerable to harassment for several minutes, but a successful gank can be greatly rewarding, granting the killer's team 680 gold (400G for the kill + 70% for the assist) and setting the slain opponent back on both experience and gold at a very early stage, which can easily become an insurmountable disadvantage.
End level: 3
Route:
Alternatively:
This route is one of them most commonly taken paths, done to strategically both prevent theft of the buff camps by the opposing team and gain a fast level advantage over opposing champions. This leaves multiple useful options for the Jungling champion, including being able to gank a nearby lane, invade the opposing jungle or simply to continue farming.
The choice of minor camp can vary depending in the jungler in question, with the usual options being the , and camp. Junglers with strong area of effect abilities will be most efficient clearing one of the former two camps, while junglers with strong single-target damage will benefit more from killing the .
End level: 4
Route:
Alternatively:
This route is a well-rounded route that equally balances ganking potential, farming experience and gold, and is useful for junglers who do not have strong ganking prowess at very early levels, as it provides enough experience for them to get their primary skill to level 2 instead of level 1.
Depending upon the speed of the jungler champion, Smite can be used to differing levels of effectiveness. On the very slowest junglers it is actually possible to Smite back-to-back camps (such as the and ), although is usually advisable to ensure it is available when taking a major buff camp to avoid dealing with their high damage output for too long.
End level: 6
Route:
- camp
- camp
- camp
- camp
- camp
- camp
- camp again
- camp again
- camp again
- camp again
- Repeat the last four steps over and over as necessary.
This passive route is chosen to maximize gold and experience income from the jungle at the expense of supporting the lanes. This route is usually used by very fast farming junglers who want to earn their gold through farming, but can also be used with junglers who have high level requirements to be able to gank effectively and wish to speed themselves to that point.
Ganking
Ganking refers to the act of ambushing one or more players with the intent of scoring a kill. It is one of the most important aspects of the jungle role, as, while anyone in a match can effectively gank to some extent, the jungler is the champion who has the greatest capacity to do so as he is not bound to any particular lane, allowing him to freely roam across the map to appear wherever he is needed. As the game progresses and more and more champions begin to roam the map and band together as opposed to extending out alone, ganking becomes less limited to the jungler and less of an important factor to success overall, but it nonetheless remains a valuable element of team strategy all the way up until a game's end.
Some champions are better at ganking than others. In particular, champions with very powerful or plentiful crowd control tend to be stronger at ganks than those without. For example, Shaco can gank a lane as early as level 2 possessing only a buff - the slow it provides and the fear from a can lock down a enemy champion for several seconds, potentially allowing Shaco to kill him before he can escape. Conversely, champions who have little to no crowd control (such as 
Shyvana) or have crowd control that can be difficult or unreliable to use effectively (such as 
Dr. Mundo) will often find themselves hard pressed to obtain kills during ganks.
A few specific junglers may have very poor initial ganking, but upon obtaining their ultimate can later gank with much more success. In such cases, the jungling champion will often focus solely on farming for the early game and later transition to ganking more heavily once level 6 has been reached. One of the quintessential examples of this is 
Warwick, who exerts poor control over an opponent from levels 1 to 5 but becomes one of the game's most lethal gankers after he reaches level 6 and acquires the use of 
Infinite Duress which serves as an instantaneous long duration suppression and a gap closer both.
There are several different types of gank that can be observed in League of Legends:
Zac preparing to jump in on a dueling 
Sejuani and 
Jax through a river gank.
River ganks are the most common type of gank and involves the jungler approaching a lane through the river, entering the brush there and beginning his assault on the opposing team once correct positioning is established. This type of gank is the most readily available to any jungler and, depending on the mobility of the ganking champion, can work successfully even against opponents who have not extended significantly beyond their own side brush.
As a tradeoff for this ease of use, however, river ganks are among the easiest to spot ahead of time for a competent team - a single 
Ward in the river bush can quickly warn a laner of the jungler's intentions and allow them to back off and avoid danger. The other types of ganks most often occur to bypass this vision of the river.
River ganks tend to be more successful at top lane for red team members and bot lane for blue team members, but teams on the opposite side have access to the loop gank below to compensate.
Side ganks (also known as a lane gank) involve the jungler entering the side brush in order to get very close to his targets before initiating the gank. This type of gank has many more limitations than a simple river gank, as it can only be done in bot or top lane and relies on a lack of vision on both within the bush from the enemy team and of the jungler as he enters it in order to maintain the element of surprise.
This gank is much more commonly done at top lane than at bot lane, as the latter contains a support champion who has the responsibility of keeping the side brush warded, but when pulled off in either case it can be extremely deadly due to the sheer proximity of the ganking champion allowing him to almost immediately lock down his target and prevent them from fleeing.
Jungling champions who do not have strong blink or dash abilities (such as Udyr) will often benefit greatly from side ganks, as their mobility issues become irrelevant at such close ranges.
Loop ganks involve the champion entering the enemy jungle from near the mid lane, and (for bot or top lane loop ganks) walking around the or Baron Nashor spawning pit and entering the target lane through the tribush or (for mid lane loop ganks) making use of the entrances to the lane on the same side as an enemy turret.
Loop ganks pose some significant risks to the jungler. If their initial approach into the enemy jungle is spotted early on with a ward, it is almost always a death sentence, as the opposing team can act together to corner and slay the champion as he makes his way down to the lane. If pulled off correctly, however, it can be equally devastating to an unaware laner, as with the use of the tribush to disguise their approach the jungler will end up directly behind the target and so does not have to immediately use their abilities to close the gap.
The riskiest gank to perform, this type of gank involves the jungler collaborating with allies to trap and kill enemies who are under the apparent safety of their turret. This gank can be done on any laner through use of the jungle - bot and top lane for red and blue team respectively uses the path and small brush directly behind the turret and the opposing side makes use of the grass near the camp. Mid lane tower dive ganks make use of the path near the spawns.
Tower dive ganks can have massive consequences if part of the dive is performed improperly due to the presence of the turret, which contributes massive damage output on a champion who attacks an ally within its range. A miscommunication between members of a team can lead to one or more allied champions being killed in the dive, which can offset the benefits of diving in the first place. Junglers who are most suited to performing tower dive ganks are ones that have abilities that can let them easily tank several tower shots and buy more time to obtain a kill (such as 
Alistar), or ones who have extremely high burst potential, allowing them to rapidly decimate enemy champions before the tower can do significant damage (such as 
Zed).
Hecarim assisting an allied in a direct gank against 
Yorick.
A direct gank involves the ganking champion dispensing with all form of subtlety and approaching his targets by walking directly down the lane towards them, and are usually done only as a last resort against enemy lanes that are heavily fortified with wards as they do not have an especially high chance of success.
Though this type of gank is technically available to all junglers, in practice only a very specific few are capable of successfully pulling one off. Almost invariably, a direct ganking champion will boast enormous mobility and multiple means of closing the gap with his opponents as well as strong crowd controls. A famous example of such a jungler is Hecarim, who has access to a movement speed-boosting ability (
Devastating Charge), a long-ranged gap closer (
Onslaught of Shadows) and a method of movement impairment ( Onslaught of Shadows) which combine to allow him to storm into a lane at high speed and quickly suppress a target champion before they can escape.
A counter gank is the unique act of a champion entering a lane where an enemy gank is already in progress with the intent of turning the fight to their favor.
This gank type follows the same rules as before in that good warding can alert a team to the incoming threat and let them back off without suffering casualties, but also equally depends on the junglers themselves. Strong counterganking junglers are champions who have excellent map mobility and can react quickly to a gank happening regardless of their current location (such as
Rammus and his 
Powerball). Junglers who are resistant to being counterganked themselves are champions whose methods of crowd control are divorced from their methods of escape, letting them rapidly switch from attacking to retreating when the need arises (such as Jax).Counter-Jungling
Counter-Jungling is a broad term which generally refers to the act of delaying the progress of an enemy jungler in some way. The reason to perform this is always the same - it is an attempt to reduce the influence the jungler has on the game in the next several minutes by depriving him of gold, experience and neutral buffs. It is usually a strictly solo affair (with one particular exception being invasions, which are covered below) and typically involves a jungler entering enemy territory to either steal unattended camps, ambush his opponent with the intention of killing him or driving him off, or both.
While any champion can potentially do this, there are champions, much like with ganking, who are more suited to counter-Jungling than others. Champions who specialize in stealing gold and experience are often those who have abilities that let them rapidly destroy camps and lessen the chances of discovery. Champions who specialize in dueling and defeating an enemy jungler will almost always pack powerful offensive steroids that let them quickly overwhelm an opponent in a 1v1, as well as the means to prevent them from escaping.
Cho'Gath and 
Trundle are two examples of champions well-suited to counter-Jungling. The former boasts heavy area of effect damage and a powerful true damage nuke from his 
Feast, letting him quickly destroy major and minor camps alike. The latter boasts enormous singletarget damage from 
Chomp and 
Frozen Domain affording him incredible dueling power against lone opponents, as well as a means to chase down and prevent their escape with 
Pillar of Ice.
Counter-Jungling is usually a very risky tactic due to the potential hazard of being discovered, cornered and killed by an enemy team. As a result, being able to do well consistently with it will necessitate a strong sense of map awareness and knowledge of champion matchups. Champions who do not wish to be caught stealing a camp must often ensure that their opponent is elsewhere at the time, such as when the enemy jungler is covering a lane for someone or has recently ganked and been forced to retreat at low health. Likewise, champions who wish to catch the enemy jungler in turn will often need to utilize their knowledge to determine their whereabouts at a specific time and whether it is safe to attempt to kill them.
Invasions
Invasions are a very specific type of counter-Jungling, usually undertaken by all five members of a team in an attempt to deprive the enemy jungler of their very first buff before the minion waves have begun to spawn. This usually involves the team utilising the bushes to stealthily approach the enemy or camp. Most commonly, this is done for the former camp as several junglers must start with the Crest of the Ancient Golem buff in order to clear effectively early on, but for the same reason stealing the Blessing of the Lizard Elder usually has the lesser chance of an early engagement.
The presence of this strategy often dictates a team's actions during the first 90 seconds of a game and is the reason why many teammates will guard around the river area of the jungle to provide advance warning in case of an invasion.
Successful invasions can have great payoffs, granting the beneficiaries an extra neutral buff for the first five minutes, buff camp experience, and potentially the First Blood bonus and early kills. Even invasions that are thwarted by good scouting can still often be successful as the enemy team may not always be in a good position to drive off the invaders.
Some team compositions can encourage or dissuade invasions more than others. Teams that have a higher chance of a successful invade are most commonly teams made of champions with strong level 1 crowd controls (such as 
Zyra's 
Grasping Roots or 
Blitzcrank's 
Rocket Grab) who can lock down off-guard opponents and allow for their team to quickly destroy them.