The Marble Mountains (Ngu Hanh Son) lie between Da Nang and Hoi An. Dubbed Hon Non Nuoc, meaning Mountain and Water in Vietnamese, there are actually five marble outcrops topped with pagodas. Each is said to represent one of the natural elements: Tho Son (Earth), Moc Son (Wood), Kim Son (Metal/Gold), Thuy Son (Water) and Hoa Son (Fire).
Thuy Son (Mountain of Water) is the largest and most famous of the five marble mountains and contains a number of caves in which Hindu, Buddhist and Cham deities are worshipped. The most impressive of these is the Huyen Khong Cave. Cathedral-like, with natural light entering through a small skyward opening, this large cave houses a large Cham Buddha, Buddhist and Confucian shrines along with various inscriptions carved into the walls.