The 10 Megapolitan Areas of China

1. Hong Kong, Pearl River Delta. Includes Macau. 
2. Shanghai, Yangtze River Delta
3. Beijing, Bohai Economic Rim.  Includes Sinuiju, North Korea.
4. Fujian-Taiwan.  Includes Xiamen, as well as the Taiwanese cities of Taipei and Kaoshiung.
5. Beibu.  (I don't recognize any of the city names).  Includes the Red River Delta region of Vietnam.
6. Central Plain.  (I don't recognize any of the city names).
7. Harbin-Changchun
8. Sichuan basis.  Includes Chongqing and Chengu
9. Wuhan area.
10. Changsha area.

Source: http://en.wikipedia.org/wiki/Metropolitan_regions_of_China