Whats the geography of China during the Ming Dynasty ?

It is hard to tell you exactly. As far as I know, the geography of that dynasty always change.
The area of land reached its peak in 1415 and covered about 735 square kilometers. Till the govern of Ming Shenzong, the area only occupied 1/3 of that in the year of 1415.

thanks that is really helpful :) you guys on this website are awesome