Hannegan caldera (Q115858047)

Summary from English Wikipedia (enwiki)

Hannegan caldera is a 3.72 million year old volcanic collapse structure in the North Cascades of the U.S. state of Washington. The caldera collapsed during two separate volcanic eruptions that produced as much as 140 km3 of rhyolite ash.

Wikidata location: 48.8733, -121.5092 view on OSM or edit on OSM

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Cascade Volcanoes natural=volcano
Volcanoes of Washington (state) natural=volcano