Physical features
Paul Subterranean River National Park consists of various landforms, the most impressive of which is the limestone that forms the karst mountain landscape of the St. Paul Mountain Range. Topography varies from flat plains to rolling hinterlands and hills to mountain peaks. Mountains characterized by a juvenile topography. More than 90% of the park comprises sharp, karst limestone ridges around Mount St. Paul which is itself part of a series of rounded, limestone peaks aligned on a north-south axis, along the western coast of Palawan. The principal feature of the park is an underground river, over 8-km long and known as the Subterranean River or St. Paul Cave. It includes major formation of stalactites and stalagmites, and several large chambers exist, up to 120 m in width and 60 m in height. The river arises approximately 2-km south-west of Mount St. Paul at an altitude of 100 m, and flows underground for almost its entire length to an outflow into the sea at St. Paul's Bay. A small marine component is included within the park boundary. Another hydrological feature is the Babuyan River, which stretching along the eastern side of the Park.