Running along 31.4km, the system of interconnected caves is nestled in the World Natural Heritage National Park of Phong Nha Ke Bang. It was discovered by a local man in 2005 and explored by the British Cave Research Association, whose team was impressed by the spectacular stalactites and stalagmites and named it Thien Duong Cave (Paradise Cave).

Most of the ground is flat, making it convenient for sightseeing and exploration. The temperature inside is always about 16 degrees centigrade lower than the outside.

The site is located 16km from the western branch of the Ho Chi Minh Highway, about 4km from Bo Trach District’s Son Trach Commune and 70km from downtown Dong Hoi City.