Wikipedia definition
1. Son Doong CaveHang Sơn Đoòng (meaning "Mountain River cave" in Vietnamese) is a cave in Phong Nha-Kẻ Bàng National Park, Bố Trạch district, Quảng Bình Province, Vietnam. The cave is located near the Laos-Vietnam border (17°27'25.88"N 106°17'15.36"E). It has a large fast-flowing underground river inside. Hang Sơn Đoòng was found by a local man named Hồ-Khanh in 1991. The local jungle men were afraid of the cave for the whistling sound it makes from the underground river.
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