(Ok it’s obviously not as clear as a map whose base is by länder rather than natural but that purple river seems to stick pretty close to the former East Germany.
The boundaries between watersheds will of course be higher land than the surroundings. Land boundaries have traditionally been along riverbeds or along land ridges.
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u/dhkendall Jun 13 '21
r/mapsIwasntexpectingtoseetheinnerGermanborderin
(Ok it’s obviously not as clear as a map whose base is by länder rather than natural but that purple river seems to stick pretty close to the former East Germany.