A reserve staff member (1st L) persuades a group of tourists not to enter the Caohai National Nature Reserve without permission in the Yi, Hui and Miao Autonomous County of Weining, southwest China's Guizhou Province, June 10, 2020. There was a time when the Caohai National Nature Reserve was threatened by water body recession and pollution, but in recent years its ecological system has greatly improved after a series of control measures were implemented here. (Xinhua/Yang Wenbin)
