The Longyou River ecological park, built along the mother river of Rugao, a county-level city administered by Nantong in East China's Jiangsu province, is filled with lush trees and lucid waters. [Photo/CFP]

In recent years, the city of Rugao has put much effort into restoring its environment, turning polluted rivers and damaged vegetation in the urban area into small ecological parks and oxygen bars. [Photo/CFP]

An aerial view of the Longyou River ecological park in Rugao [Photo/CFP]