From Wikimedia Commons, the free media repository
English: The Marble Mountains ("Five elements mountains") are a cluster of five marble and limestone hills located in Ngu Hanh Son ward, south of Da Nang city in Vietnam. The five 'mountains' are named after the five elements; Kim (metal), Thuy (water), Moc (wood), Hoa (fire) and Tho (earth).
Thuy Son 
Huyen Khong Cave 
Other caves 
Tho Son 
Kim Son, Hoa Son 
Element: Metal (Kim Son), Fire (Hoa Son).
Moc Son