Ered Mithrin.

Grey Mountains.

Ered Mithrin, the Grey mountains was in origin the last remnants of the wall of Ered Engrin east of Hithaeglir and Forodwaith north of it was once Dor Daedeloth. But in the reshaping of Arda at the end of First age Dor Daedeloth crumbled and sank and only small parts were left of Ered Engrin. In Second and Third age it on maps looks like Ered Mithrin is a spur of northern Hithaeglir but the truth is it was Hithaeglir who stretched out south from Ered Mithrin.

In the eastern end of Ered Mithrin the mountains divided into two spurs, a northern and a southern, between those two spurs the area were called Withered Heath. In the west were Hithaeglir stretched down south were Mount Gundabad. As told was Forodwaith north of Ered Mithrin, south were from the west; the northern vales of Anduin, Mirkwood and furthest east Erebor. Even further south-east was the Iron Hills.

From the east to the west the mountains stretched some 350 miles. From the mountains in the west came river Greylin and the Forest River.