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Limestone karst and natural rocks.

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Because it is a great touring spot and is aspectacular limestone karst landscape.

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The Puerto Princesa part is named after a couple that passed away and the underground river part is because it is an underground river.

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Not that I could find.

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Around November 12, 1999.

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They are formed by the dripping minerals above the cave.

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Puerto Rico

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This river is one that goes through a cavern full of different rock formations and is an amazing touring spot!

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Puerto Princesa Underground River, Philippines

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The river is also called 1. The St. Paul Underground River.
2. Tourists can travel on the river in a fiberglass boat.
3. One of the rock formations in the cavern the river travels through looks like a naked lady.