Calderas

thumb|right|Mount Mazama's eruption timeline, an example of caldera formation

island in the Pacific Ocean administered by Costa Rica

Western island in the Galapagos Archipelago in Ecuador

Medvezhya (; , Moyoro-dake) is a volcanic complex located at the northern end of Iturup Island, Kuril Islands, Russia. Rheniite, a rhenium sulfide mineral (ReS2), was discovered within the active hot fumaroles of the volcano in 1994

mountain in Namibia