Aerial photo taken on May 29, 2019 shows sheepskin rafts beside the Yellow River in Longwan Village, Baiyin City of northwest China's Gansu Province. 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/Chen Bin)