Borders are now settled once and for all Not necessarily. For example, The Netherlands and Belgium exchanged parts of lands in 2017 to make their border align

Borders are now settled once and for all Not necessarily. For example, The Netherlands and Belgium exchanged parts of lands in 2017 to make their border align again with the Meuse river: https://nos.nl/artikel/2112869-nederland-krijgt-belgisch-schiereiland https://nos.nl/artikel/2112869-nederland-krijgt-belgisch-sch... For context: the border originally followed the flow of the river, but a few decades earlier the river was straigthened by dredging to enhance the traffic on the river; the border was left as-is though, leaving both countries with hard-to-reach peninsulas on the "wrong" side of the river.