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Correct me if I'm wrong, but each tile is 2 KM square. That would, by my math, equate to a 100 KM squared area in a 5x5 area (10*10); and as pointed out above, you could try opening up all 81 squares. But remember, the game is designed to use only 9 tiles; more than that, if fully developed, will cause problems.
25 tiles is as bradybrklyn said: 100 square km's.
81 Tiles (maximum map size) is 324 square km's.
Playing with up to 25 tiles won't have any major issues (baring usual perfomance issues/limits). However certain things (such as hydro-electric dams) can have issues when placed outside the 25 tile area.