Phong Nha-Ke Bang covers 300 different grottoes and caves. Phong Nha cave is assesed by BCRA as the top cave in the world due to its 4 top records: the longest underground river, the highest and longest cave, broadest and most beautiful fine sand beaches inside the caves, the most spectacular stalagmites and stalactites. According to the assessment of UNESCO, The karst formation of Phong Nha-Ke Bang National Park has evolved since the Palaeozoic (some 400 million years ago) and so is the oldest major karst area in Asia and Phong Nha displays an impressive amount of evidence of earth’s history. It is a site of very great importance for increasing our understanding of the geologic, geomorphic and geo-chronological history of the region.
Besides the grotto and cave systems, Phong Nha has the longest underground river. The Son and Chay are the main rivers in this national park. There are over ten spectacular streams, springs and waterfalls in Phong Nha-Ke Bang area, namely: Gió waterfall, Madame Loan waterfall, Má»c stream erupting from a limestone mount range, and Tra Ang stream.


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