The one kilometer red line around Chaohu Lake refers to the sewage treatment scope. The state exercises special management over the coastlines of rivers and lakes in the Yangtze River basin. The National Yangtze River Basin Coordination Mechanism coordinates the departments of natural resources, water administration, ecological environment, housing and urban and rural construction, agriculture and rural areas, transportation, forestry and grassland in the State Council, and the people's governments at the provincial level in the Yangtze River Basin to delimit the protection scope of river and lake shorelines, formulate protection plans for river and lake shorelines, strictly control the development and construction of shorelines, and promote the rational and efficient utilization of shorelines. Official website (20 19 12.25) shows that the 14th meeting of the Standing Committee of the 13th Provincial People's Congress formally passed the revised Regulations on Prevention and Control of Water Pollution in Chaohu Lake Basin, which stipulates that the construction of projects under construction within the red line around the lake (1 km) can be resumed once the sewage and sewage are treated.