Global Volcanism Program | Image GVP-07428
The Loma San Juan peak lies along the northern crater rim of Laguna de Alegría, a crater lake at the summit of Tecapa. Geothermal features are active along the rim of the crater lake and an area of hydrothermally altered clay containing up to 45% sulfur is found nearby.
Photo by Giuseppina Kysar, 1999 (Smithsonian Institution).
This image is made available under the Creative Commons BY-NC-ND 4.0 license terms.