Robben Island (Afrikaans Robbeneiland) is an island in Table Bay, seven kilometres off the coast of Cape Town, South Africa. The name is Dutch for "seal island". Robben Island is roughly oval in shape, 3.3 km long north-south, and 1.9 km wide, with an area of 5.07 km². It is flat and only a few metres above sea level, as a result of an ancient erosion event. The island is composed of Precambrian metamorphic rocks belonging to the Malmesbury Group.