The Mouths of Entwash is a biome located around where the river Entwash splits into several smaller streams and meets the Anduin. It is a marsh biome, similar to Swanfleet, and is mostly uninhabited. These swamps were created due to the floods resulting from the Long Winter. The swamps of Nindalf, opposite this biome on the other side of the Anduin, is the overflow from the mouths of the Entwash. Upon entering the biome the player earns the achievement "Last Marsh of the Ents'"