Tourists enjoy rafting on the Yellow River in Longwan Village, Baiyin City of northwest China's Gansu Province, May 29, 2019. Sheepskin raft, made of inflated sheepskin, used to be an important means of transportation tool for locals living along the banks of the Yellow River. Now it has become popular vehicles for tourists to sightsee along the Yellow River. (Xinhua/Li Yibo)