Yao ethnic women wash their long hair along the riverside at a celebration of "Sanyuesan" festival in Longsheng County, south China's Guangxi Zhuang Autonomous Region, April 18, 2018. People of China's Yao ethnic group in Longsheng have a tradition to celebrate the Sanyuesan Festival on the third day of the third lunar month. (Xinhua/Wei Jiyang)