This discussion paper is based on analysis of peri-urbanization dynamics in the Hangzhou-Ningbo Corridor of the Lower Yangtze Region of China. The case-study area is of particular interest, both because of the scale of the phenomenon in the area and the fact that the corridor typifies the long-running and dynamic peri-urbanization process occurring in the Lower Yangtze Region as a whole, arguably the world's largest extended urban region (EUR). Analysis focuses on adaptation, successful and otherwise, to the severe stresses, demographic, social, and environmental, accompanying peri-urbanization. Policy implications are then drawn; anticipated future stresses in the case-study area, and by implication the larger extended urban region, are used to trigger recommendations.