Subglacial calderas

Grímsvötn (; vötn = "waters", singular: ) is an active volcano with a (partially subglacial) fissure system located in Vatnajökull National Park, Iceland. The central volcano is completely subglacial and located under the northwestern side of the Vatnajökull ice cap. The subglacial caldera is at , at an elevation of . Beneath the caldera is the magma chamber of the Grímsvötn volcano.

volcano in Iceland

Bárðarbunga (, alternative name Veiðivötn), is an active and productive stratovolcano located under Vatnajökull, which is Iceland's most extensive glacier, in Vatnajökull National Park. The second highest mountain in Iceland, above sea level, Bárðarbunga is also part of the Bárðarbunga-Veiðivötn volcanic system that is approximately long and wide.

thumb|280px|Hvannadalshnúkur, the highest peak of Öræfajökull. Öræfajökull (; 'Öræfi glacier' or 'wasteland glacier') is an ice-covered volcano in south-east Iceland. The largest active volcano and the highest peak in Iceland at , it lies within the Vatnajökull National Park and is covered by part of the glacier.

stratovolcano in Alaska, United States