Phonolitic lava flows in the volcanic cauldron "Caldera de las Cañadas" as seen from the viewpoint "El Tabonal Negro" towards mountain "Montana Guajara", Teide National Park, Tenerife, Spain.
<a href="//commons.wikimedia.org/wiki/User:Quartl" title="User:Quartl">Quartl</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>