Shuanglonghu, China

With a population of 3,520,000, Shuanglonghu is a sprawling district in Chongqing, China's largest municipality. While the area benefits from proximity to the Yangtze and Jialing Rivers, the bureaucracy involved in navigating the Liangjiang New Area's 31 subdistricts and 11 towns can be a persistent headache. Chongqing's subtropical climate, with its high humidity and frequent thunderstorms, is another factor to weigh for prospective residents. Overall, Shuanglonghu may appeal to those seeking an inland Chinese megacity experience, but the sheer scale and red tape could overwhelm all but the most resilient expats.