The grassy area in the sunlight at the left center is an explosion crater formed on the SW side of El Castillo volcanic horst, whose high point forms the right horizon. The breached crater is one of the Quaternary vents formed during reactivation of the horst.

Photo by Lee Siebert, 1998 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

La Yeguada