The largest glen on the island is Glen Iorsa to the west, whilst narrow Glen Sannox (Gaelic: Gleann Shannaig) and Glen Rosa (Gaelic: Gleann Ròsa) to the east surround Goat Fell. The terrain to the south is less mountainous, although a considerable portion of the interior lies above , and A' Chruach reaches at its summit. There are two other Marilyns in the south, Tighvein and Mullach Mòr (Holy Island).