Maar
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A maar is a broad, low-relief volcanic crater caused by a phreatomagmatic eruption. A maar characteristically fills with water to form a relatively shallow crater lake, which may also be called a maar.
The ten-day phreatomagmatic eruption that formed the Ukinrek maars
The Devil Mountain Lakes on the Seward Peninsula in western Alaska – the largest maar-based lakes in the world
The three maars at Daun (from front to rear): the Gemündener, Weinfelder and Schalkenmehrener Maar
Weinfelder Maar
Phreatomagmatic eruption
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Phreatomagmatic eruptions are volcanic eruptions resulting from interaction between magma and water. They differ from exclusively magmatic eruptions and phreatic eruptions. Unlike phreatic eruptions, the products of phreatomagmatic eruptions contain juvenile (magmatic) clasts. It is common for a large explosive eruption to have magmatic and phreatomagmatic components.
Ashfall deposit of phreatomagmatic origin, overlying lapilli fall deposit of magmatic origin
Crest of old tuff ring, including part of the maar crater of a monogenetic volcano, Tenerife, Canary Islands. The maar crater has been used for agriculture.
Koko Crater is an old extinct tuff cone in the Hawaiian Island of Oahu.
Fort Rock, an eroded tuff ring in Oregon, US.