NANNING, July 19 (Xinhua) -- The Nakao River, which used to be a sewage ditch in Nanning of south China's Guangxi Zhuang Autonomous Region, has turned into a beautiful wetland park, thanks to the ecological and environmental improvement by local government in recent years.

Aerial photo taken on July 18, 2020 shows a woman walking in the Nakao River wetland park in Nanning, south China's Guangxi Zhuang Autonomous Region. (Xinhua/Zhou Hua)

Aerial photo taken on July 18, 2020 shows people exercising in the Nakao River wetland park in Nanning, south China's Guangxi Zhuang Autonomous Region. (Xinhua/Zhou Hua)

People visit the Nakao River wetland park in Nanning, south China's Guangxi Zhuang Autonomous Region on July 18, 2020. (Xinhua/Cao Yiming)

A woman exercises in the Nakao River wetland park in Nanning, south China's Guangxi Zhuang Autonomous Region on July 18, 2020. (Xinhua/Cao Yiming)

People take photos in the Nakao River wetland park in Nanning, south China's Guangxi Zhuang Autonomous Region on July 18, 2020. (Xinhua/Cao Yiming)

 Combo photo shows an aerial view of the Nakao River wetland park on July 18, 2020 (up) and the Nakao River before the ecological and environmental improvement (file photo) in Nanning, south China's Guangxi Zhuang Autonomous Region. (Xinhua/Cao Yiming)

 People exercise in the Nakao River wetland park in Nanning, south China's Guangxi Zhuang Autonomous Region on July 18, 2020. (Xinhua/Cao Yiming)

Aerial photo taken on July 18, 2020 shows a woman exercising in the Nakao River wetland park in Nanning, south China's Guangxi Zhuang Autonomous Region. (Xinhua/Zhou Hua)

Aerial photo taken on July 18, 2020 shows people visiting the Nakao River wetland park in Nanning, south China's Guangxi Zhuang Autonomous Region. (Xinhua/Zhou Hua)■