At a wetland park in Rongcheng, Shandong province, groups of egrets rest and forage in the woods, enjoying the quality ecological system of the wetland. In recent years, Rongcheng has focused on cleaning up water basins, aiming to restore the functions of main rivers, improve the aquatic ecology of rivers and enhance irrigation and supplementary water supply capacity. The water quality near the coast has maintained an excellent rate for several consecutive years.