Lake Maughan, which is officially called Lake Holon, is at the top of Mount Melibengoy. The volcano has an elevation of and a base diameter of 40 km. It has a 2.9-km-wide caldera with steep walls that rise 200-500m above the lake.
Mt Melibengoy is considered one of the sacred places of the T’boli tribe. It hosts a rare species, Parantica dannatti reyesi, which was discovered by the late Professor Josue de los Reyes of Notre Dame of Marbel University and published in the Entomological Journal of Senckerburg Research Institute in December 1994.
Government officials have also confirmed sightings of the Philippine Tarsier, Tarsius syrichta which can supposedly be found in the barangays surrounding Lake Holon.