三区三线

Three zones delineated by three lines for land use

三区即农业空间、生态空间、城镇空间三种类型的国土空间。三线即分别对应在农业空间、生态空间、城镇空间划定的耕地和永久基本农田保护红线、生态保护红线、城镇开发边界三条控制线。

This is a concept used in China to delineate the boundaries that define three distinct types of land use. The three zones are agricultural zones, ecological preservation zones, and urban development zones, while the three lines are the red line for protection of farmland and permanent basic cropland, the red line for ecological conservation, and the boundary line for urban development.