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The Puerto Princesa Underground River - Puerto Princesa Subterranean River National Park features a limestone karst mountain landscape with an 8.2 km. navigable underground river.
Turingskie
• @Turingskie (387)
• Philippines

The Puerto Princesa Underground River - Puerto Princesa Subterranean River National Park features a limestone karst mountain landscape with an 8.2 km. navigable underground river.