Emyn-nu-Fuin
From Tolkien Gateway
Emyn-nu-Fuin was the Elvish name for the east-west range of high forested hills that ran through northern Mirkwood. The name Emyn-nu-Fuin literally means 'hills under shadow', but the name is connected to the Sindarin name for the Forest, Taur-nu-Fuin, and so is usually translated 'Mountains of Mirkwood'.