For those of you who can read Chinese
here is a link to the highest res scan of the 1820 map from the major atlas of Chinese history (left mine back in Arizona, so I'm blanking on the exact title).
The historical map is superimposed on a modern map, and is quite complete, insofar as major cities, rivers, and provinces are concerned. You may notice some interesting political claims when it comes to "international boundaries," particularly when it comes to tributary states like Korea and Tibet. Feel free to ignore the nationalist agenda, and my apologies for the simplified characters. (at least it's not a map of the Warring States Period!)
I found one other interesing map,
for your consideration. The text is a little hard to read, but if I have it correctly, in game parlance, orange is core provinces, pink is colonies (territories), and tan is satellites (tributary states).
I know this is not much of a direct contribution, but it never hurts to have more reference material.