I'm creating a map with 70+ territory. There are some small territory, i enlarge it with circle, it's still too small, the question is, How large the territory should be?

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PS:

• Answer in format ??x?? pixel
  
• There are some people with smaller territory, but they are allowed
  

Edited 2013-11-23 12:36:06

I use 20x20 pixel circle to see if army number fits.

16 by 16 is the absolute minimum, 20 by 20 is better.