Balinsasayao Twin Lakes Natural Park surrounding Lake Balinsasayao and Lake Danao is approximately 8,000 hectares, part of the 133,000-hectare Geothermal Reserve managed by the PNOC. Lakes Balinsasayao and Danao are two small crater lakes separated by a narrow mountain ridge in a hallow surrounded by mountains. Lake Balinsasayao has a surface area of 76 hectares (190 acres) and maximum depth of around 90 metres (300 ft). The smaller Lake Danao, on the other hand, has a surface area of 30 hectares (74 acres) and maximum depth of around 58 metres (190 ft).
