Beijing, July 11 (Youth.cn) - River and lake wetland in Yinchuan is abundant and clear in summer time. Birds flying above, a natural picture unfold on the land of Ningxia. Adhering to ecological development principle, local authority pays efforts to keep rivers and lakes clean. A urban water ecological circle that contains rivers, lakes, ditches, channels, reservoirs and wetlands is taken shape and possesses regional water resources regulation function. Photo/VCG