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Region talk.
If we do go with the old outline which is almost just copypasta Australia with a few little changes here and there. Could we scale it? Seems like it would be very Australian and very comfy to have fuckhuge routes and caves to explore with less focus on the cities. They're there just to be pit stops really. Barring the few big ones. You know? It's pretty easy say, if the route is twice as long, halve the exp gained. That way you aren't worried too much about level scaling.
Pic related is my idea on just the southeast, expanded from earlier.