Border
A line dividing the areas over which two states exercise sovereignty, set through treaties, wars, or negotiations. Some follow natural features such as rivers and mountain ranges, while others are drawn as straight lines along lines of latitude or longitude.
In the village of Baarle on the Belgium-Netherlands border, national borders cut through individual buildings. A building's nationality is determined by its front door location, and some doors straddle both countries. Medieval lords' land deals became today's border lines.
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