Aerial photo taken on Dec. 10, 2019 shows the scenery of the Danjiangkou Reservoir region in Xichuan County of Nanyang, central China's Henan Province. The middle route of China's south-to-north water diversion project begins at the Danjiangkou Reservoir and runs across Henan and Hebei provinces before reaching Tianjin and Beijing. (Xinhua/Feng Dapeng)