Ras Morthil
From Tolkien Gateway
Ras Morthil (S. "Peak Blacktine") was the last mountain on a soutehr spur of the White Mountains. It stood on the cape of Andrast. The mountain chain that ran along the length of the cape was, for a long time, the home of tribes of the Drúedain.
Etymology
Ras means "horn" (cf. Caradhras); Morthil is composed obviously from the well-attested element mor plus the element til seen in Celebdil. After r, the sound t becomes th.