The beach of Trégrom. For a change from the usual beaches by the sea, there’s the beach of Trégrom. Situated on the banks of the Léguer, it has everything one could wish for. How about a swim? If you prefer walking to swimming, you can always go visit the viaduct of Trégrom just behind the beach. The viaduct was built in the 1860s and served as one of the main locations for the film “The Battle of the Rails”.