Definition of Aleutian Islands and trench

Stretching 1,243 miles

(2,000 km) west from the western tip of the Alaskan Peninsula,

the Aleutian Islands form a rugged chain of volcanic

islands that stretch to the Komandorski Islands near the

Kamchatka Peninsula of Russia. The islands form an island

arc system above the Pacific plate, which is subducted in the

Aleutian trench, a 5-mile (8-km) deep trough ocean-ward of

the Aleutian Islands. They are one of the most volcanically

active island chains in the world, typically hosting several

eruptions per year.

The Aleutians consist of several main island groups,

including the Fox Islands closest to the Alaskan mainland,

then moving out toward the Bering Sea and Kamchatka to

the Andreanof Islands, the Rat Islands, and the Near Islands.

The climate of the Aleutians is characterized by nearly constant

fog and heavy rains, but generally moderate temperatures.

Snow may fall in heavy quantities in the winter

months. The islands are almost treeless but have thick grasses,

bushes, and sedges, and are inhabited by deer and sheep.

The local Inuit population subsists on fishing and hunting.

The first westerner to discover the Aleutians was the Danish

explorer Vitus Bering, when employed by Russia in 1741.

Russian trappers and traders established settlements on the

islands and employed local Inuit to hunt otters, seals, and fox.

The Aleutians were purchased by the United States along with

the rest of Alaska from Russia in 1867. The only good harbor

in the Aleutian is at Dutch Harbor, used as a transshipping

port, a gold boomtown, and as a World War II naval base.

See also PLATE TECTONICS.

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