Topography varies from flat terrain to rolling hinterlands, from hills to mountain peaks. The three main peaks are Cleopatra’s Needle (1,500m), Mt. St. Paul (1,028m) and Mt. Bloomfield (870m). the limestone or karst outcrop known as the St. Paul mountain range. The karst is 11 km long, averages 3-5 km wide and covers an area of around 35 sq. /km. It is estimated to be between 16 – 20 million years old.
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. It provides water to local communities for domestic an agriculture use.