The Buluan River is a black river in Province of Maguindanao and Sultan Kudarat in the island of Mindanao in the Philippines. Located in Buluan joint by the Liguasan Marsh stream of the Rio Grande de Mindanao. The total length of the Buluan River system including the upper Palian River is 109 km (68 mi) and 36.5 km (22.7 mi) from Lake Buluan to Liguasan Marsh.