The broad irregular ridge on the horizon NE of the Pacific coastal plain is El Valle volcano in Panama. El Valle de Antón caldera is within the volcanic complex and post-caldera lava domes can be seen in the center of the horizon. Late-Pleistocene Plinian eruptions from El Valle have produced pyroclastic flows that reached the coast. Tertiary volcanic centers surround the caldera complex.

Photo by Lee Siebert, 1998 (Smithsonian Institution).

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

El Valle