Volcanic craters

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

circular depression in the ground caused by volcanic activity

thumb|The ten-day phreatomagmatic eruption that formed the [[Ukinrek maars]] thumb|The Devil Mountain Lakes on the Seward Peninsula in western Alaska – the largest maar-based lakes in the world

thumb|Halema'uma'u after the 2018 collapse events. The floor of the larger Kīlauea Caldera can be seen at left. thumb|Aerial photo of Halemaʻumaʻu in 2009, showing a white eruption column|plume being emitted by an active [[lava lake.]] thumb|In March 2013, the glow from the lava lake at the bottom was clearly visible after dark. thumb|Halemaʻumaʻu Crater Lake in October 2019. The yellow water is the result of dissolved minerals and sulfur. 2008 Map of Kīlauea Caldera with Halemaʻumaʻu lower left.|thumb

mountain in West Java, Indonesia

tourist spot in Indonesia

mountain in Hume, Victoria, Australia

volcanic crater in Tanzania, Africa

depression formed by a sinking or collapse of the surface lying above a void or empty chamber

mountain in West Java, Indonesia

volcanic caldera in Arusha Region of Tanzania

small volcanic crater on the french island Réunion

mountain in Canada