The great oval lake that lay in the mid-course of the River Anduin, which entered it through the Gates of Argonath to the north and the emptied in the rushing falls of Rauros some twenty miles to the south. The lake, whose name is translated as 'Mist-cool Water', was surrounded on all sides by the grey stony hills of the Emyn Muil. Most important among its surrounding hills were two that lay at its southern end, the famous Amon Hen and Amon Lhaw, the Hills of Sight and Hearing.
Also near its southern end was the lake's only island, named Tol Brandir in Elvish, that Men called the Tindrock. Its steep rocky sides made landing on the island nearly impossible, and legend said that no Man had ever stood on the Tindrock Isle.