To discover these fortifications, composed of ramparts, bastions and potter's halls open on the ditches, what could be better than the use of another typical heritage of the region: a "bacôve", this traditional wooden boat which was used, in the Middle Ages, to transport goods.
In this flat-bottomed boat with a clapboard, you can sail peacefully around this set of ramparts in a natural environment and green landscapes.
Imposing, robust, stable (and of course approved for passenger transport): several bacôves await you in Gravelines for a unique way to visit these fortifications, classified as a Historical Monument since 1936.