Most of the Shan State is a hilly plateau, the Shan Plateau, which together with the higher mountains in the north and south forms the Shan Hills system. The gorge of the Thanlwin (Salween/Namhkong) River cuts across the state. Inle Lake where the leg-rowing Intha people live in floating villages, in the great Nyaung Shwe "plain", is the second largest natural expanse of water in Burma, shallow but long and wide. Pindaya Caves near Aungpan are vast limestone caverns which contain 6,226 Buddha images.