Here's some more about 'Choc City' aka 'Little Africa', a Chinese city with a large foreign community. Note the two demonstrations by Africans in Guangdong - they won't have gone down well with the PSB there. In their wake, negative repercussions for expats have undoubtedly resulted, including the new draconian Chinese visa regulations.

http://news.echinacities.com/detail/8410-Expat-towns-in-China-5-Chinese-Cities-with-Large-Foreign-Communities