Welcome to the Guild! Your English is very good for a non-native speaker (better than my Polish!) but I don't quite understand your question. The village you want to draw will fit within the red bordered region? And nearby villages come right up to the edges of it in the southwest and northeast?
If you're saying that you don't want to show those villages, only the one you're focusing on, you might try drawing everything and then "fuzzing" the areas beyond your village out...like a camera view that shows a flower clearly but the background is blurry. Photoshop has a tool called Gaussian Blur which would do this for you (using selections and perhaps the feather option) but there are other plug-ins you could use. I don't know about GIMP but I think it will have something similar.
If I've misunderstood your problem please try to clarify if you can. Hope that helped!