Augustine Island, unihabited volcanic island, S Alaska, in Kamishak Bay at mouth of Cook Inlet. The active Augustine (or St. Augustine) volcano, which forms the entire island, rises to 4,134 ft (1,260 m); ash from its last major eruption (1986) reached Anchorage, some 180 mi (290 km) to the northeast. The 1883 eruption is believed to have caused a 30-ft (9-m) tsunami locally.
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