The Chinese phrase Four Great Ancient Capitals of China (中国四大古都 pinyin zhong1 guo2 si4 da4 gu3 du1) refers to Nanjing, Beijing, Xi'an, and Luoyang.
... families residing in the town. The population density is 245.1/km² (635.7/mi²). There are 545 housing units at an average density of 167.0/km² ...