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A strange surveying mistake

The German count of river kilometers officially starts at the border between Saxony and Bohemia at Gelobtbachbrücke near Schöna on the left bank of the river Elbe. The German kilometer 0 is identical with the Czech kilometer 105,81. Czech and German kilometers run parallel for 3,43 kilometers since the border runs in the middle of the river; the Czech river kilometers continue to the border crossing at Schmilka/Hřensko. After 121 of the German river kilometers a strange surveying error occured in 1880 because the kingdoms of Prussia and Saxony had measured the river each on its own and at the border of these two territories it suddenly became obvious that there was a redundant kilometer. The pragmatic solution was to introduce a kilometer 121a that follows the regular kilometer 121. The unconventional addition exists to this very day.