Puerto Princesa Underground River (Philippines)

Puerto Princesa Underground River National Park is located about 50 miles north of Puerto Princesa City, Palawan, Philippines. It features a limestone karst mountain landscape with miles 8.2. navigable underground river. A distinguishing feature is the river that winds through a cave before flowing directly into the South China Sea. 

It includes major formations of stalactites and stalagmites, and several large rooms. The bottom of the river subject to tidal influence. Underground river known as the longest in the world. At the mouth of the cave, a clear lagoon is framed by ancient trees growing right to the water's edge. Monkeys, large monitor lizards, and squirrels find their niche on the beach near the cave.