Bogoslof Island

Bogoslof Island or Agasagook Island is the summit of a submarine stratovolcano at the south edge of the Bering Sea, northwest of Unalaska Island of the Aleutian Islands chain. It has a land area of and is uninhabited. It is long and wide, with a peak elevation of . The stratovolcano rises about from the seabed, but the summit is the only part that projects above sea level. About northwest of Bogoslof, a small volcanic dome emerged in 1883 from the same stratovolcano and has become a stack rock formation known as Fire Island. On the southwest side of Bogoslof, another dome erupted in 1796; it is now called Castle Rock. Other eruptions have occurred in 1796–1804, 1806–1823, 1883–1895, 1906, 1907, 1909–1910, 1926–1928, 1992, and 2016–2017. The island is a breeding site for seabirds, seals, and sea lions. An estimated 90,000 tufted puffins, guillemots, red-legged kittiwakes and gulls nest here.