Aerial photo taken on Dec. 5, 2019 shows the view of Yinghu Lake of Hanjiang River in Ankang, northwest China's Shaanxi Province. Hanjiang River is a key water source of China's south-to-north water diversion project. (Xinhua/Shao Rui)

Aerial photo taken on Dec. 5, 2019 shows the view of Yinghu Lake of Hanjiang River in Ankang, northwest China's Shaanxi Province. Hanjiang River is a key water source of China's south-to-north water diversion project. (Xinhua/Shao Rui)

Aerial photo taken on Dec. 5, 2019 shows the view of Yinghu Lake of Hanjiang River in Ankang, northwest China's Shaanxi Province. Hanjiang River is a key water source of China's south-to-north water diversion project. (Xinhua/Shao Rui)

Aerial photo taken on Dec. 5, 2019 shows the view of Yinghu Lake of Hanjiang River in Ankang, northwest China's Shaanxi Province. Hanjiang River is a key water source of China's south-to-north water diversion project. (Xinhua/Shao Rui)

Aerial photo taken on April 7, 2019 shows the view of Hanjiang River in Ankang, northwest China's Shaanxi Province. Hanjiang River is a key water source of China's south-to-north water diversion project. (Xinhua/Shao Rui)

Aerial photo taken on April 7, 2019 shows the view of Hanjiang River in Ankang, northwest China's Shaanxi Province. Hanjiang River is a key water source of China's south-to-north water diversion project. (Xinhua/Shao Rui)

Aerial photo taken on Dec. 5, 2019 shows the view of Yinghu Lake of Hanjiang River in Ankang, northwest China's Shaanxi Province. Hanjiang River is a key water source of China's south-to-north water diversion project. (Xinhua/Shao Rui)

Aerial photo taken on Dec. 5, 2019 shows the view of Yinghu Lake of Hanjiang River in Ankang, northwest China's Shaanxi Province. Hanjiang River is a key water source of China's south-to-north water diversion project. (Xinhua/Shao Rui)

Aerial photo taken on Dec. 5, 2019 shows the view of Yinghu Lake of Hanjiang River in Ankang, northwest China's Shaanxi Province. Hanjiang River is a key water source of China's south-to-north water diversion project. (Xinhua/Shao Rui)

Aerial photo taken on Dec. 5, 2019 shows the view of Yinghu Lake of Hanjiang River in Ankang, northwest China's Shaanxi Province. Hanjiang River is a key water source of China's south-to-north water diversion project. (Xinhua/Shao Rui)