Lake Holon — also known as Maughan Lake — is a stunning crater lake nestled inside an extinct volcano on the slopes of Mount Parker in T’boli, South Cotabato on the island of Mindanao. Regarded as one of the most beautiful lakes in the Philippines, it is surrounded by dense forest and crystal clear water. The trek to Lake Holon takes approximately three to four hours through the forest with a local guide. The lake is a sacred site for the T’boli indigenous people and visitors are expected to respect local customs and regulations. Overnight camping at the lake is a popular option.