The town, located next to the lower reaches of the Jialing River, was at one time an important source of china-ware and used to be a busy commercial dock during the Ming and Qing dynasties,[142] Fishing Town or Fishing City is one of the three great ancient battlefields of China. It is noted for its resistance to the Mongol armies during the Southern Song dynasty (1127–1279) and the location where the Mongol leader Möngke Khan died in 1259,[143] Xueyu Cave in Fengdu County is the only example of a pure-white, jade-like karst cave in China,[144] Fengdu Ghost City in Fengdu County is the Gate of the Hell in traditional Chinese literature and culture. Snowy Jade Cave, see Xueyu Cave (above).