When in rue du Châtelet, (the Office de tourisme is 150m farther on the right), go down left (on your left again you’ll see the port).
Retrace your steps and follow the street to the Office de tourisme.
The second half of the 19th century saw the creation of two ports in St-Jacut: one for summer and the mackerel fishing season: la Houle Causseul; the second one for winter, protected from the dangers of the sea: le Châtelet, where you can find a remarkable salt storage room.
Both retain their authenticity.
Even though it looks modest, St-Jacut was, in the 1930's, the second largest port of the Côtes-du-Nord, (Côtes d'Armor's former name)