Bogoslof Island or Agasagook Island (Aleut: Aĝasaaĝux̂) is the summit of a largely submarine stratovolcano located in the Bering Sea in the U.S. state of Alaska, 31 miles (50 km) behind the main Aleutian volcanic arc. It has a land area of 173 acres (0.70 km²) and is unpopulated. The peak elevation of the island is 490 feet (150 m). It last erupted in 1992. It is 1.76 kilometres (1.09 mi) long and 540 metres (0.34 mi) wide.