Nanjing (Chinese: 南京; Romanizations: Nánjīng (Pinyin), Nan-ching (Wade-Giles), Nanking (Postal map spelling)) is the capital of China's Jiangsu Province, and a city with a prominent place in Chinese history and culture. Nanjing (literally: 'Southern capital') served as the capital of China during several historical periods, including as the former capital city of Republic of China, and is listed as one of the Four Great Ancient Capitals of China. Nanjing is also one of the fifteen sub-provincial cities in the People's Republic of China's administrative structure, enjoying jurisdictional and economic autonomy only slightly less than that of a province.

Located in the lower Yangtze River drainage basin and Yangtze River Delta economic zone, Nanjing has always been one of China's most important cities. Apart from having been the capital of China for six dynasties and of the Republic of China, Nanjing has also served as a national hub of education, research, transportation and tourism throughout history. With an urban population of over five million, it is also the second largest commercial center in the East China region, after Shanghai.

Geography and climate

Nanjing has a humid subtropical climate and is under the influence of the East Asia Monsoon. Seasons are distinct in Nanjing, with usually hot summers and plenty of rainfall throughout the year. Along with Wuhan and Chongqing, Nanjing is often referred to as one of the "Three Furnacelike Cities" along the Yangtze River (长江流域三大火炉) for the perennially high temperatures in the summertime. The average temperature during the year is . The average high temperature in January is while the average low is ; the average high in July is with an average low of . The highest recorded temperature is (July 13, 1934), and the lowest (Jan 6, 1955). On average it rains 117 days out of the year, and the average annual rainfall is . The time from mid-June to the end of July is the plum blossom Meiyu season, during which the city experiences a period of mild rain as well as dampness.

Nanjing is endowed with rich natural resources, which include more than 40 kinds of minerals. Among them, iron and sulfur reserves make up 40 percent of those of Jiangsu province. Its reserves of strontium rank first in East Asia and the South East Asia region. Nanjing also possesses abundant water resources, both from the Yangtze River and groundwater. In addition, it has several natural hot springs such as Tangshan Hot Spring in Jiangning and Tangquan Hot Spring in Pukou.