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- #21
Yes, it's here: Long Valley Caldera - WikipediaAre you sure Beautress? I can’t confirm it anywhere else (usually the USGS tracks these). They do have an super cool map though, showing all the active volcanos and their alert levels: Volcano Hazards Program | U.S. Geological Survey
And the USGS is here with a map: Long Valley Caldera | U.S. Geological Survey