On the island of Palawan, in the Philippines, a course of water crosses a mountain of limestone before reaching the sea directly. The underground river of Puerto-Princesa has 8.2 kilometers and forms an unusual environment in which fresh water and marine water are found inside the cave. The lower portion is brackish and is influenced by the tides,...
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On the island of Palawan, in the Philippines, a course of water crosses a mountain of limestone before reaching the sea directly. The underground river of Puerto-Princesa has 8.2 kilometers and forms an unusual environment in which fresh water and marine water are found inside the cave. The lower portion is brackish and is influenced by the tides,...