Aerial photo taken on April 10, 2019 shows a boat sailing on the Baiyangdian lake in Xiongan New Area, North China’s Hebei province. Restoration work has started in Baiyangdian Lake, northern China’s largest freshwater body. High-pollution and energy-intensive production has been tackled. As a result, water quality has improved remarkably. [Photo/Xinhua]

Aerial photo taken on April 10, 2019 shows the Zhaozhuangzi village of Anxin county in Xiongan New Area, North China’s Hebei province. Restoration work has started in Baiyangdian Lake, northern China’s largest freshwater body. High-pollution and energy-intensive production has been tackled. As a result, water quality has improved remarkably.[Photo/Xinhua]

Aerial photo taken on April 10, 2019 shows tourist boats sailing near a pier on the Baiyangdian lake in Xiongan New Area, North China’s Hebei province. Restoration work has started in Baiyangdian Lake, northern China’s largest freshwater body. High-pollution and energy-intensive production has been tackled. As a result, water quality has improved remarkably. [Photo/Xinhua]

Wang Mutou (1st, L) interprets at Baiyangdian memorial hall of anti-Japanese war in Xiongan New Area, North China’s Hebei province, April 10, 2019. Restoration work has started in Baiyangdian Lake, northern China’s largest freshwater body. High-pollution and energy-intensive production has been tackled. As a result, water quality has improved remarkably. [Photo/Xinhua]

Tourists visit the Baiyangdian scenic area in Anxin county of Xiongan New Area, North China’s Hebei province, April 10, 2019. Restoration work has started in Baiyangdian Lake, northern China’s largest freshwater body. High-pollution and energy-intensive production has been tackled. As a result, water quality has improved remarkably. [Photo/Xinhua]