of cone remnants are located within 1 km of the north coast. Geothermal activity is observed in coastal areas. Volcanic activity is evident from the hot water springs which emerge close to the shore which are mostly covered by the tide. There is a reef which surrounds the island and prevents the sea from damaging the coast.

The Saboma Crater is the highest point on the island, at 254 m above sea level. It forms the crater rim of the inactive volcano in the middle of the island. It has a maximum width of about 2 km. The sides of the crater