Nanjing is an ancient city with thousands of years of history, it has been the southern capital of China, one of the four great ancient capitals of China. 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.

Please visit http://en.wikipedia.org/wiki/Nanjing for further readings.