四岳
Chagulak Island (also spelled "Chugul", "Chugula", "Chegoula", or "Tchougoulok"; ) is a small, uninhabited volcanic island in the Islands of Four Mountains group in the Aleutian Islands of southwestern Alaska, United States. The -wide island consists of a single cone that reaches an elevation of 3,747 ft (1,142 m). Chagulak is a stratovolcano and is separated from the nearby Amukta Island by a channel about wide; though the two islands are joined underwater. No eruptions have been recorded and very little is known about the volcano, as the only study done on Chagulak so far is a single chemical analysis of a "low-potassium, high-alumina basaltic andesite" from the north shore.