Puerto Princesa Underground River. The world’s longest underground river system accessible to man can be found at the St. Paul National Park in the province of Palawan. It is 8 kilometers long. (Photo: OP-PCSD)
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Puerto Princesa Underground River. The world’s longest underground river system accessible to man can be found at the St. Paul National Park in the province of Palawan. It is 8 kilometers long. (Photo: OP-PCSD)
Turismo Mismo! 