The Puerto-Princesa Subterranean River, a UNESCO World Heritage site in the Philippines, is a stunning natural wonder featuring a navigable underground river that stretches over 8 kilometers through a vast limestone cave system. This unique ecosystem boasts dramatic karst landscapes, pristine waters, and a rich biodiversity, including rare species like the Philippine cockatoo and monitor lizard. Visitors can explore the river by boat, marveling at its towering stalactites and stalagmites, while its global significance lies in its geological formations and ecological value, making it a must-see destination for nature enthusiasts.

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