Aerial photo taken on Dec. 21, 2016 shows the South-North Lake in Haiyan County of Jiaxing City, east China's Zhejiang Province. Water quality of Zhejiang Province has greatly improved since the provincial government in 2013 proposed a plan of five treatments on water -- sewage treatment, flood control, drainage discharge, guaranteeing water supply and promoting water conservation. (Xinhua/Han Chuanhao)