Shanghai's Regional Dominance: How the Megacity Shapes the Yangtze River Delta Ecosystem SECTION 1: GEOGRAPHIC AND ECONOMIC OVERVIEW• Regional Composition: - Core: Shanghai Municipality (6,341 km²) - Immediate Circle: Suzhou, Wuxi, Nantong, Jiaxing - Extended Delta: Nanjing, Hangzhou, Ningbo, Hefei - Total population: 150+ m