Eichholzmaar close to German village Steffeln, 2017. The maar is approximately 120 m across and has a depth of 3 m.
<a href="//commons.wikimedia.org/wiki/User:Colling-architektur" title="User:Colling-architektur">Colling-architektur</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>