The Serpentine River is a river in the Northwestern part of Valoran, the Summoner's Rift is situated on both sides of the River. The epic monster Baron Nashor, and the monster Dragon are said to live in the river.
According to the map of Valoran, the river flows out from underneath Demacia, as well as out of the Howling Marsh and the Marshes of Kaladoun, beginning at the top of Crystal Scar in Kalamanda. These three main tributaries join into one, running through Summoner's Rift and ultimately out into the Kaladoun, just west of Freljord.
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