Nanjing, the capital of Jiangsu Province for short, is located in the southwest of Jiangsu Province, at the lower reaches of the Yangtze River. It starts from 31 ° 14 ′ N latitude in the south, ends at 32 ° 37 ′ N latitude in the north, starts from 118 ° 22 ′ E longitude in the west, ends at 119 ° 14 ′ E longitude in the east. The maximum east-west horizontal distance is about 70 kilometers, and the maximum north-south longitudinal distance is about 150 kilometers. The city plane is long from north to south and narrow from east to west, covering an area of 6587.02 square kilometers. Nanjing is an important central city in eastern China, an important scientific research and education base and a comprehensive transportation hub in China. It is the only megacity in the Yangtze River Delta, an important gateway city for the development of central and western regions driven by the radiation of the Yangtze River Delta, one of the first batch of national historical and cultural cities, and a national key scenic tourist city.