China Internet Map
Check out this pic, it 
contains a map of the major ISPs in China and how fast are their Internet connections into other countries like Japan or the US and via which IPs and cities (only the three major Chinese cities are displayed, not sure whether all the traffic goes trhrough there).
You can get more interesting statistics about Internet usage in China at this URL http://www.cnnic.net.cn/en/index/0O/index.htm
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