Maug Islands: Three islands, the caldera of an ancient volcano form the Maug Islands of the Northern Mariana Islands and are roughly 2 square kilometers in area. They are referred to as North, East, and West Islands. Maximum elevations of the islands are as follows; North-227 meters, East-215 meters and West-178 meters. Where the volcano cone was is now a deep and spacious natural harbor. Steep cliffs border the islands and the landscape on the north and west islands is dominated by columns of basalt resembling tombstones.
Vegetation on the islands consist mostly of grasses with a few coconut palms. During World War II (1939-1945) the islands were used by the Japanese as a weather station.