The region is also formally known as the Southern Tagalog Islands.

Puerto Princesa Islands Philippines
Puerto Princesa City Underground River

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

It includes major formations of stalactites and stalagmites, and several large chambers. The lower portion of the river is subject to tidal influences. The underground river is reputed to be the world's longest. 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.

The Puerto Princesa Subterranean River National Park in Palawan province has topped the latest ranking of the nominees vying to become the New7Wonders of Nature. As of September 29, the Puerto Princesa treasure climbed to the top spot from 5th place, according to the Web site of the New7Wonders of Nature Campaign.

Mindoro (divided into Occidental Mindoro and Oriental Mindoro), Marinduque, Romblon and Palawan (El Nido, Puerto Princesa)
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