Both the north and south sections of the island are high ground of relatively untouched forest, in the south comprising two volcanic mountains, Mount Lidgbird () and Mount Gower which, rising to , is the highest point on the island. The two mountains are separated by the saddle at the head of Erskine Valley. In the north, where most of the population live, high points are Malabar () and Mount Eliza (). Between these two uplands is an area of cleared lowland with some farming, the airstrip, and housing.