Aerial photo taken on Aug. 9, 2017 shows the Jiuzhou Cultural Plaza of the Lakeside Park in Jizhou District of Hengshui City, north China's Hebei Province. The local government took a lot of measures to improve the local environment and converted the once saline and alkaline land into an ecological park with the total green area reaching 1.29 million square meters. (Xinhua/Mu Yu)