Stretching nearly more than 900 miles (1,500 kilometers) southwest of the Alaskan peninsula between the Bering Sea and the Gulf of Alaska are the Aleutian Islands. These islands, formed by volcanoes over many thousands of years, range in elevation from sea level to over 6,200 feet (1,900 m). The highest points are bare rock and basaltic rubble. Despite the harsh environment, this ecoregion supports many seabird colonies of extraordinary size and global importance. For example, the Pribilof Islands provide breeding habitat for about three million seabirds.
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