Ngu Hanh Son, also known as Marble Mountains, is an area known for its stunning natural beauty and spiritual significance. This is a group of five limestone and marble hills named after the five elements: Kim (metal), Thuy (water), Moc (wood), Hoa (fire), and Tho (earth). The area is renowned for its stone-carving villages and historical sites, including several caves and pagodas like the Huyen Khong Cave and Non Nuoc Pagoda. Visitors can explore the mountains or simply relax on the pristine beaches that stretch along the coastline.