Lake Mainit is the fourth largest lake in the Philippines, having a surface area of 173.40 square kilometres (66.95 sq mi). The lake is also the deepest lake in the country with maximum depth reaching 223 metres (732 ft). It is located in the northeastern section of Mindanao and shared between the provinces of Surigao del Norte and Agusan del Norte.
The Lake Mainit Development Alliance (LMDA) is an alliance of municipalities or local government units, government line agencies and civil society organizations in Lake Mainit area. Its significant role is to serve as the coordinating body of multi stakeholders in preserving and promoting Lake Mainit ecosystem.
Guadalupe Mabugnao Mainit Hot Spring National Park is a protected area of the Philippines located in Barangay Guadalupe in Carcar, Cebu, some 50 kilometers from the provincial capital Cebu City. The park covers an area of 57.50 hectares occupying an important watershed forest reserve in the central Mantalongon mountain range. It was declared a national park in 1972 by virtue of Republic Act No. 6429.
The Mainit Hot Springs Protected Landscape is a protected landscape area located in the province of Compostela Valley on the island of Mindanao in the Philippines. It preserves the sulfuric hot springs and surrounding forest in Nabunturan municipality which also contains the headwaters of the Manat River, a source of water supply for surrounding villages. First declared a national park in 1957 by virtue of Proclamation No. 466 by President Carlos P. Garcia, it had an initial area of 1,381 hectares (3,410 acres). Under the National Integrated Protected Areas System, it was reclassified as a protected landscape through Proclamation No. 320 issued in 2000 by President Joseph Estrada. The hot springs are a popular ecotourist attraction in Compostela Valley. Its name "Mainit" is a Filipino word which means hot.