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The Puerto Princesa Underground River is reputed to be the longest navigable underground river in the World. It is one of the few such rivers which the public can easily experience and appreciate. It is one of the New 7 Wonders of Nature, Palawan 2012..Of all the seven thousand islands of the Philippines, Palawan is considered the most beautiful, the "Last Frontier Eco" . In this thin strip of land 450 km long and wide just 50, Palawan is home to 87 of 160 ethnic groups in the Philippines, 11 percent of the remaining virgin forests, over 38 percent of the mangroves, the sentries who save the earth from the aggression the sea...