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Sep 1, 2015 at 8:43 comment added leo That depends a lot of the technology at hand, though. If you look at older European borders, you will find that e.g. lakes are not borders, but rather in the middle of nations, as that is where it's possible to travel and transport, whereas areas with only forests are difficult to get through, and are often border areas.
Aug 31, 2015 at 20:05 history answered celtschk CC BY-SA 3.0