Is there a detailed and complete list of China's wholesale markets? And where can I find it?

Hello,

Buying goods from China and selling it abroad is not a new story; my question is: where are those markets (at least the major ones) where Chinese and foreign traders meet to do these transactions? I've vaguely heard of Yiwu, Guangzhou and Shenzhen but I was wondering if there's a detailed and complete list of China's top trading places (markets and their specialties) and if not is it possible to list me what you think are the top 10 wholesale markets or trading places in China? We're interested in purchasing from China sometime in the future but to do so we need more information.

Regards