Lake Mithrim.

Lake Mithrim in Northern Mithrim in the Central Highlands was a 30 Miles long and 10 Miles wide lake feeded by 3 rivers from Ered Wethrim all unnamed; one from the North, one from the East and one from the South. From the lake ran one river leading to Annon-in-Gelydh passed the Mountains of Mithrim.

In the very early stages of the tales the lake was called Asgon. (Lt.1.)