Maars

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

mountain in Kenya

lake on the occupied Golan Heights, Syria

mountain and crater in Gran Canaria, Spain (European Union)

mountain in Sudan

volcanic crater in Saudi Arabia

left|thumb|Grænavatn ("green lake"). left|thumb|Hnausapollur . Veiðivötn (, "fishing lakes") is a volcanic lake region in the Highlands of central Iceland, where approximately 50 lakes fill two rows of fissure vents.

volcanic field in Iran

volcanic group in China

crater and nature reserve in the German alps

Megata is a volcanic group on the Oga Peninsula in northwestern Honshu, Japan. It consists of three basaltic-to-dacitic maars at the edge of the peninsula. These maars measuring between and across are filled with water, forming freshwater lakes. Ichinomegata is the widest and oldest of the three. These features date to around the Pleistocene although pottery discovered between layers of tephra has been dated to 4,000 years before present. An older and larger maar is located offshore on the western coast of the peninsula, known as Toga (Togowan), it formed 450,000 years ago. The western wall of