Agattu (Aleut: Angatux̂) is an island in the Near Islands in the western end of the Aleutian Islands. With a land area of 85.558 square miles (221.59 km²) Agattu is one of the largest uninhabited islands in the Aleutians. It is the second largest of the Near Islands, after Attu Island. It is volcanic and considerably mountainous. The treeless island has a tundra-like terrain which reaches a peak of 2,073 feet (632 m) above sea level.