Opływ Motławy
Śródmieście, Poland · built 1600
The Opływ Motławy (Umfluter, lit. 'Motława Flow-around') is the name given to the remaining part of the moat that was once part of the 17th-century fortifications of the city of Gdańsk. Although underdeveloped, it has been undergoing revitalizaton efforts since the 1990s.
Canal data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).