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On December 10, 1990, during a routine trip into the jungle, Mr. Ho Khanh accidentally discovered the cave entrance which now became known as Hang Son Doong. Sơn Đoòng cave is located in, in Phong Nha-Kẻ Bàng National Park, Bố Trạch District, Quảng Bình Province, Vietnam,It is one of the world's largest natural caves, Sơn Đoòng has an internal, fast-flowing subterranean river and the largest cross-section of any cave, worldwide, as of 2009 it is believed to be twice that of the next largest passage. Its name, Hang Sơn Đoòng, is variously translated from Vietnamese as 'cave of the mountain river' or 'cave of mountains behind Đoòng As a solutional cave, it was formed in soluble limestone and is believed to be between 2 and 5 million years old. Forrest Galante is an American outdoor adventurer, television personality, and conservationist. He works in the field of wildlife b
