The cool and calm waters in Palawan’s Subterranean Underground River give leeway for a wonderful banca trip down to the underground river. The river winds around limestone caverns that were carved from the precipitated waters. The underground river directly flows to the sea subjecting its cavern entrance to tidal influences. The underground river, by virtue of Proclamation No. 835 on March 26, 1971 was officially declared to be called as the Puerto Princesa Subterranean River National Park and is now included as one of the UNESCO World Heritage Sites. The rocky mountain that comprises the land forms of the park is covered with lush tropical rain forests. A small portion of the park is vegetated with karst limestone. The Puerto Princesa Subterranean River National Park is also popular with other tourist sites aside from the famous underground river. Worth mentioning are the wildlife preservation park, the endangered Palawan mousedeer and famous peacock pheasants. The Philippines Cockatoo are also found here.