The Northern Marianas
island of Alamagan
is located north from Saipan and is 11.12 km² (4.295 sq mi) in area. The island's volcano
(Bandeera Peak) has a large caldera
at the summit. The volcano last erupted in 1917. The west side is cut by deep gorges covered with high savanna grass. The southeast side is a steep slope of bare lava. There are deep valleys with caves. Coconut palms grow on the gradual slopes. Warm fresh water springs are located on the northern part of the west coast.
Alamagan is the home of the endangered Nightingale Reed-warbler Acrocephalus luscinia which presently can be found only here and on Saipan and possibly Aguijan .
Historically the island has been sporadically populated; as of late 2005 there were seven inhabitants on Alamagan. The 2000 census reported an official population of six persons. The island is part of the Northern Islands Municipality.