Treduder: Coastal Valleys and Cultural Heritage

Treduder combines a rural landscape with traces from different periods. The cultivated plateau, hedgerow countryside, coastal valleys and wooded slopes each add a distinct character. At the Lieue de Grève, the shoreline is sandy and muddy; inland, valleys and slopes shape the landscape. Churches, a calvary, a spring and remnants of a local railway are also among the features that distinguish the area.

Landscape between the plateau and the coast

The landscape includes a cultivated plateau, bocage hedgerow countryside, coastal valleys and wooded slopes. Bocage refers to a landscape divided by hedgerows. The Yar Valley lies west of the plateau. Its lower valley is narrow, bordered by steep slopes, and extends about four kilometres inland. Its remarkable beech-covered slopes give the valley a character of its own.

The Roscoat offers a different natural environment: it is a river where salmonids are found. A survey carried out in 2004 described remarkable plant and animal life in its lower valley, little known across the département. At the time, mammals found there included the protected otter. The landscape themes of the two valleys are therefore distinct: the Yar is defined by its steep, wooded slopes, while the Roscoat is characterised by its river and its flora and fauna.

At the Lieue de Grève, the coast is characterised by sandy, muddy shorelines. The 2004 survey found that overwintering birds used this area. In winter, the coast is a focal point for overwintering birds; in the valleys, slopes and rivers shape the landscape.

Churches, archaeological traces and railway heritage

The triangular fortification traces at Coz-Castel date from the Gallo-Roman period. They add an archaeological dimension to the later architectural and cultural heritage. Treduder is also home to remnants of the former metre-gauge Lannion–Plestin-les-Grèves–Finistère local railway. Remains are preserved between Pont-ar-Yar and Pont-ar-Roscoat. The line ran along the coast for about one kilometre.

Saint-Théodore Church brings together several building periods. It dates from the first half of the 16th century and the second and third quarters of the 17th century; architectural elements from the 15th century have also been preserved. Different parts of the church have different heritage-protection status: the bell tower was classified as a Monument historique by decree on 19 January 1911, while the rest has been listed in the supplementary inventory since 27 June 1989.

Two other religious structures have precise historical dates: the Roscoat calvary dates from 1533, and the Saint-Tuder fountain was built in 1718. Together with Saint-Théodore, they offer several points of interest for exploring the area’s architectural and cultural history.

Plan your walk and visit

The “Tréduder et ses ruisseaux” trail is a moderately difficult 9.90-kilometre walk. The average duration is 3 hours and 25 minutes. This gives both the distance and an estimated time for this particular walk.

Saint-Théodore Church is open as part of the Circuit des Chapelles and the European Heritage Days, and by request at the town hall. As these arrangements may change, check current visiting options with the town hall in advance.

Discover more destinations: Perros-Guirec, Belle-Isle-En-Terre, Caurel, Paule, Taden, Le Foeil, Loscouët-Sur-Meu, Penvénan.

View the broader travel guide: Côtes-D’armor.