Canal de Calais

The Canal de Calais is a canal in the Pas-de-Calais department that connects Calais with the Aa at Ruminghem.
Construction of the canal began as early as the 17th century, but it was not fully operational until 1758. In the 1980s, the canal was widened over 2/3 of its length.
The canal connects the Pas de Calais in Calais via Coulogne, Les Attaques, Nortkerque, Audruicq and Ruminghem with the Aa, near the hamlet of Pont-du-West. At the hamlet of Le Pont d'Ardres there is a branch to Ardres.
The canal is 30 km long and has 3 locks.
en.wikipedia.org/wiki/Canal_de_Calais

History is palpable, photo highlight

Southern arm of the ring of waterways surrounding the historic center of Calais, essentially where previously protective moats were located.