Mainit Hot Spring National Park

Mainit Hot Spring National Park is a protected geothermal area in Surigao del Norte province in northeastern Mindanao, Philippines, located on the shores of Lake Mainit — the fourth-largest lake in the Philippines — where bicarbonate geothermal springs emerge at temperatures above 60°C from the volcanic and tectonic geology of the Philippine Archipelago. The park's natural hot springs flow directly into the cool lake and forest, creating dramatic temperature contrasts and a biologically unique mixing zone that supports endemic aquatic species found nowhere else on Earth. The remote and biodiverse setting of Lake Mainit, surrounded by indigenous Mamanwa and Higaonon communities with deep connections to this thermal landscape, makes Mainit Hot Spring National Park one of the Philippines' most ecologically and culturally significant natural thermal sites.