Väddö canal
Norrtälje Municipality, Sweden
The Väddö Canal (Swedish: Väddö kanal) is an artificial canal first dug in the 16th century to provide a sheltered passage between the Bagghusfjärden to the south and the Väddöviken to the north. The canal separates the island of Väddö from the mainland, and passes through the village of Älmsta at its northern end, and the lake of Storfjärden towards its middle.
Canal data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).