Puerto Princesa Subterranean River
The 5-mile-long island of Palawan Puerto Princesa Subterranean River is the world's longest navigable underground river. Lined by nearly 15 km long cave stalactites and stalagmites, including the world's largest cave chamber into the South China Sea.
The surrounding park is a UNESCO World Heritage Site, is equally impressive, and is home to more than 800 species of plants, 165 species of birds, 30 species of mammals, 19 species of reptiles, nine different types of bats.
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