Thien Duong Cave (ie: the cave of the sky) in the Phong Nha-Ke Bang National Park, Quang Binh Province, Vietnam, 60 miles northwest of Dong Hoi a cave, the length 31 km with a width of 90 m, and some parts, has a maximum height of 150 meters. It is the longest cave in Asia, and hopes filled with magical and mysterious formations, no wonder the province of Quang Binh to attract tourists. The most spectacular cave in Vietnam was the longest dry cave found in Vietnam. Discovered in 2005 by the British Cave Research Association. It is said the beauty of the Thien Duong cave is at an imperial palace, and AOS (Cave Research Association) hope that this cave is a major sights. 
Flow along the 500m section is open for tourists, and Truong Thinh Group, with over 40 billion VND ($ 2,000,000) investment in a tourism project. Thien Duong cave in the heart of limestone mountains, surrounded by pristine forests, AOS said a pleasant journey to the mouth of the cave. Inside was a beautiful thing stalactites and stalagmites of all four legs, formed over thousands of years. British cave explorers called this “paradise” (Thien Duong). Its size is a beauty that would attract the travelers, the cave has a 90-150m wide and 80m high. British experts said immediately Thien Duong as “the largest and most beautiful caves in the region Phong Nha-Bang.” For 2005, the scientists believe that the cave was not more than 5 km, but they came back, and they found the remaining 26 km. In contrast to the Phong Nha caves – fear is the atmosphere at 
Thien Duong which are always cold and humid with temperatures averaging 20-21 degrees. Sitting in front of the cave, you can feel the blast of cold air, a pleasant break safely. At the beginning of the cave is a large arch is said that the mountain spirit, to symbolize that the peace prevailing in the defense.
Dec 122011