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Il Parco nazionale del fiume sotterraneo di Puerto Princesa è un parco che si trova circa 50 chilometri a nord della città di Puerto Princesa. Dal 1999 il parco fa parte dell'elenco dei Patrimoni dell'umanità dell'UNESCO, mentre nel gennaio del 2012 è stato inserito fra le nuove sette meraviglie naturali del mondo. Il parco si trova nella catena montuosa di San Paolo, ed è caratterizzato da un paesaggio carsico, calcareo, con un fiume sotterraneo navigabile per 4,5 chilometri della sua lunghezza.