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A broad, shallow crater, typically filled by a lake, formed by a volcanic eruption with little lava.‘Monogenetic volcanoes are small and occur as scoria cones, tuff cones and rings, and maars; they form from single, typically brief eruptions.’
hollow, bowl, basin, pan, hole, cavity, pocket
- ‘However, with an initial diameter of about 1,500 m the Messel maar was certainly considerably larger than the Eckfeld Maar.’
Early 19th century from German dialect, originally denoting a kind of crater lake in the Eifel district of Germany.
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