Dorthonion
From Tolkien Gateway
Dorthonion was a highland region lying immediately to the north of Beleriand; overrun by Morgoth in the Dagor Bragollach, after which it was known as Taur-nu-Fuin.
Dorthonion was a highland region lying immediately to the north of Beleriand; overrun by Morgoth in the Dagor Bragollach, after which it was known as Taur-nu-Fuin.