The undissected stratovolcano of Amukta volcano makes up most of nearly circular 7.7-km-wide Amukta Island (Amuux̂tax̂ in Aleut). It is the westernmost of the Islands of Four Mountains chain. The cone about 5.8 km in basal diameter and topped by a 0.4 km wide summit crater appears on synthetic-aperture radar imagery to be built upon a 300+ meter high east-west trending arcuate ridge.
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