Atka Island is the largest island in the Andreanof Islands of the Aleutian Islands of Alaska. The island is 50 miles east of Adak Island. It is 65 miles long and 2–20 miles wide with a land area of 404.6 square miles, making it the 22nd largest island in the United States. The northeast of Atka Island contains the Korovin volcano which reaches a peak of 5,030 feet. Ogl…Atka Island is the largest island in the Andreanof Islands of the Aleutian Islands of Alaska. The island is 50 miles east of Adak Island. It is 65 miles long and 2–20 miles wide with a land area of 404.6 square miles, making it the 22nd largest island in the United States. The northeast of Atka Island contains the Korovin volcano which reaches a peak of 5,030 feet. Oglodak Island is located 3.4 miles off Cape Kigun, Atka's westernmost point.