Danube–Oder Canal
Austria · built 1940
The Danube–Oder Canal (Donau-Oder-Kanal, Kanał Odra-Dunaj, Czech: Kanál Odra-Dunaj) was a planned, partially constructed, and in 2023 definitely cancelled artificial waterway in the Lobau floodplain of the Danube at Vienna, that was supposed to stretch along the Morava River to the Oder at the city of Kędzierzyn-Koźle in Poland.
Canal data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).