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A boundary is a real or imaginary line that marks the outer limit of something. It can be a limit, a border, or an edge. In land descriptions, a system called "metes and bounds" uses natural landmarks or man-made structures to define property lines.12

An example of a significant boundary is the Radcliffe Line, drawn in 1947 to separate India and Pakistan. This line led to one of the largest mass migrations in history and has been a source of ongoing disputes between the two nations.3

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