Pit, sump transformed to ecological parks in north China's Hebei

Aerial photo taken on Aug. 19, 2018 shows Yingzhou Park in Hejian City, north China's Hebei Province. Yingzhou Park, transformed from an abandoned sump, has become an ecological park covering 51 hectares of green space and 44 hectares of water area. (Xinhua/Zhu Xudong)