皇冠体育app

Photo taken on June 27, 2017 shows an aerial view of Ningchang ancient town of Wuxi, Southwest 皇冠体育app's Chongqing municipality. The history of local salt production here can be traced back to over 4,000 years ago according to historical records. Brine pits in Wuxi served as a key source of salt production in the Three Gorges area. The ancient salt-trading road, which started from east Sichuan, now east Chongqing, and ran through 皇冠体育app's hinterland, served as an important carrier of economic and cultural exchanges in the joining regions of Hubei, Chongqing, Hunan and Guizhou in the ancient times. [Photo/Xinhua]