Los Hervideros de San Jacinto, are a nest of boiling fumaroles fueled by the underground geothermal activity.
"Fumaroles are openings in the Earth’s crust, often in the neighborhood of volcanoes like Telica, which emit steam and gases such as carbon dioxide, sulfur dioxide, hydrochloric acid and hydrogen sulfide. The name solfatara is given to fumaroles that emit sulfurous gases, like at San Jacinto. Use extreme caution, as these escaping gases may make breathing difficult. From the perspective of groundwater, fumaroles could be described as a hot spring that boils off all its water before the water reaches the surface. They may occur along tiny cracks or long fissures, in chaotic clusters or fields (as at San Jacinto), and on the surfaces of lava flows and thick deposits of pyroclastic flows."
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