phrase, which means the enclosed Nanjing City and the urban area around it. Another frequently used phrase, Nanjing Metropolitan Region (Nanjing Dushi Quan, 南京都市圈), includes Nanjing and surrounding cities and areas, with acreage over 60 thousand km2 and population over 30 million. In 2001, 60% urban people of Nanjing, i.e., 1.5 million people lived inside the Nanjing City, just a similar population size of Nanking (Jiankang) in Jin dynasty 1600 years ago. After rapid expanding in recent years, the urban area of Nanjing is more than 1000 km2, near 20 times larger than the Nanjing City. The total administrative area of Nanjing is about 6600 km2. See also Nanjing Nanjing City Wall Notes Nanjing