Aleutian Islands, chain of islands that separate the Bering Sea (north) from the main portion of the Pacific Ocean (south). They extend in an arc southwest, then northwest, for about 1,100 miles (1,800 km) from the tip of the Alaska Peninsula to Attu Isl
Aleutian Trench, submarine trench located on the south side of the Aleutian Islands between the Gulf of Alaska and the Komandor Islands in the North Pacific Ocean. The Aleutian Trench reaches a maximum depth of 26,604 feet (8,109 metres) at about 51° N,