A section of the Circuit du Moulin de Sey runs through the hamlet of Launay in Trelly. The full circuit is 11.5 kilometres long, with a stated duration of 2 hours 45 minutes. This gives you a concrete point of reference for comparing the scope of an outing with the time you have available. Alongside the walk, the Sienne and several historical landmarks are central points of interest. Trelly therefore offers two distinct ways to explore: a clearly measured circuit and the history of a mill, chapel and statue.
Plan the walking route
The Place de l’église de Trelly is the recommended starting point for the Circuit, which is walked clockwise. The starting point and direction provide clear guidance for planning your route. The 11.5 kilometres and stated duration apply to the circuit as a whole; in Trelly, one section of it lies in the hamlet of Launay. This helps distinguish the scope of the full circuit from its connection to the village.
The time estimate helps you decide whether the circuit fits into your daily schedule. Also allow for any breaks you plan to take. Before setting out, check the current route and trail conditions. This lets you plan using the recommended guidance without treating the duration as an estimate for other routes.
Moulin de Sey and the Sienne
At the Moulin de Sey, a footbridge crosses the Sienne and connects Trelly with Quettreville-sur-Sienne. The grounds of the Moulin de Sey are open to the public and suitable for picnicking or fishing in the Sienne. The bridge and mill grounds represent different aspects of the river: the bridge connects the two communities, while the grounds offer the stated opportunities for spending time there.
If you plan to picnic or fish, check the facilities on site. This will help you decide whether to combine your time by the river with a visit to the grounds. The route details for the Circuit give you a separate point of reference: they apply to the circuit and its recommended starting point, not to how long you spend at the mill grounds.
Chapel and traces of history
The Chapelle des Ermites is on private property and can be seen during the walk. This access information is important for planning: the chapel is visible from the route, but the property is private.
The statue of the martyr Saint Clair dates from the first quarter of the 15th century. The Moulin de Sey was built before the French Revolution of 1789; the Chapelle des Ermites was built in 1903. These dates provide different points of reference: the statue from the early 15th century, the mill from the pre-Revolutionary period and the chapel from the 20th century. This allows you to consider the three historical features separately, rather than combining them into a single building history.
A seasonal connection to the Sienne
The Sienne also has a seasonal connection: in autumn, Atlantic salmon swim upstream to spawn. If you take nature-related interests into account when planning your trip, autumn can serve as a point of reference for this aspect of the river. This adds another perspective on the area alongside its historic buildings: here, the focus is on a seasonal natural process rather than a construction date or route length.
The information about the area therefore offers several ways to choose what to focus on: the length, duration and direction of the circuit; the chapel’s access information; the historical dates; and the Sienne’s connection with autumn. You can prioritise these interests according to how much time you have during your stay, without having to fit every topic into the same day trip.
Discover more destinations: Gratot, Le Mesnil-Rogues, Tessy-Sur-Vire, Gourbesville, Treauville, Romagny, Sainte-Croix-Hague, Buais
For the main travel overview: Manche.
