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Island Hopping · Puerto Princesa City, Palawan
A UNESCO World Heritage Site and one of the New 7 Wonders of Nature: an 8.2 km navigable underground river running beneath a limestone mountain to the sea. Guided paddle-boat tours glide through vast caverns of stalactites and stalagmites while bats wheel overhead. Permits are limited, so book ahead. Best for: every Palawan visitor — a genuine bucket-list natural wonder.