The Park serves as a catchment to two important river systems, namely the Cabayugan River that flows down the slopes of Mt. Bloomfield, irrigating paddy farms before disappearing under Mt. St. Paul to become the underground river, and the Babuyan River which at 54 km is the longest river in Palawan. originates from the highlands behind Barangay Marufinas flowing through the Kayasan CADC, Barangay Tagabinet, Barangay Maoyon before emptying into the Honda bay. It provides water to local communities for domestic an agriculture use.
Climate
There are only two types of weather prevailing in the area, the wet and dry season. It is usually wet from June to December and dry and hot the rest of the year. Average temperature is 29 C while the annual average rainfall is 1,148 mm/ yr. The average relative humidity is high at around 85%.