 The main settlement on the island today is <unk> , which <unk> <unk> <unk> and is surrounded by in @-@ bye land to the east of the hill <unk> ( which runs south from West <unk> ) . To the west the island is <unk> by a belt of glacial <unk> about one and a half kilometres in length . Much of the rest of the area consists of a shallow <unk> soil that may be derived from glacial till . There is an almost complete absence of peat on the island and due to the volcanic rocks the soils are relatively fertile . The lack of peat led to ' turf <unk> ' for fuel and the bare areas of rock in the interior . 
