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Island Hopping · 5WXG+J9H, Puerto Princesa City, Palawan
A UNESCO World Heritage Site and New 7 Wonders of Nature: an 8.2 km underground river flowing beneath a karst mountain to the sea. Guided paddle-boat tours drift through cathedral-sized caverns of dripping limestone formations alive with swiftlets and bats. Permits are capped — book in advance. Best for: every Palawan visitor; a true natural-wonder highlight.