
Tourists visit Liupan Mountains National Forest Park in Jingyuan, northwest China's Ningxia Hui Autonomous Region, Aug. 6, 2015. Liupan Mountains National Forest Park is known as the "green pearl" of the Loess Plateau.(Xinhua/Peng Zhaozhi)

Tourists visit Liupan Mountains National Forest Park in Jingyuan, northwest China's Ningxia Hui Autonomous Region, Aug. 6, 2015. Liupan Mountains National Forest Park is known as the "green pearl" of the Loess Plateau.(Xinhua/Peng Zhaozhi)