Route de Tertre Guy in Mesnil-Roc'h and Saint-Pierre-de-Plesguen

Parking available: see practical information

Yellow markings

(S/E) From the town hall car park, go around the building on the right and take the Passage du Chanvril. At the Place de la Mairie, take the Ruelle de l'Église opposite to the Place du Tertre, turn right and continue for about 50 metres.

(1) Turn left into an alleyway that crosses a housing estate.

(2) When you reach the social services building, a wooden structure, turn left and take the path on the right towards the pond. It is lined with fitness trail stations.

(3) Go around the Étang de la Vallée pond on the left.

(4) At the end of the circular route, turn left and continue on the path, which will turn left after about 300 metres. You will reach the hamlet of La Morvonnais.

(5) Go straight through this hamlet, leaving a road on your right. At the end of the hamlet, take the path on the right for about 500 metres.

(6) Turn left onto the path. Follow it straight ahead through the woods, crossing an intersection, until you reach Rocher Marie.

(7) Cross the road and continue straight ahead. Turn right in front of the houses, then follow a grassy path downhill for about 50 metres on the left. The path branches off to the right and, after a stretch through the woods, takes a gravel path on the right that runs alongside a forest on the left. The path climbs and leads to a crossroads. Turn left and continue to a fork in the road.

(8) Turn right onto the road to Tertre Guy, where the road turns sharply left. It continues along a wooded dirt track. At the edge of the woods, the stony path veers right, almost due south. After 500 metres, the path splits in two.

End of yellow markings

(9) Take the path on the left towards the hamlet of La Ville ès Liez, leave it on your left and continue to the road. Follow it to the right and take the grassy path on the right which leads to an intersection with the D10.

(10) Take it to the right and pass Les Renardières, staying on the road.

Return to the yellow markings

(11) At the exit of the hamlet, after the bridge, take the path on the right at the wayside cross. The path quickly turns left. Stay on the path until you reach a road.

(12) Turn right, then take the path on the left that enters the woods. Find the path you took on the way there and take it to the left, heading south-west towards the start.

(6) At the intersection you passed on the way there, take the track on the left and then immediately take the one on the right. Continue until you reach the road.

(13) Take the road on the left for about 100 metres to admire the old bread oven on the right at the first house. Then turn around.

(13) Continue straight ahead. At La Morvonnais, turn left.

(5) Take the same route back to the pond.

(4) Keep left and continue to Rue Joseph Alanic. Take the street on the right at the crossroads until you reach the junction.

(2) Take the same route back to return to the starting point (S/E).

Car parks

Place Ange Denis: 48.446501798227395, -1.91298596613265.
Rue de l'Égalité: 48.446333938316776, -1.910898903142071.
Lotissement de la Vallée: 48.448645867899224, -1.9129597165199366.
Toilets next to the town hall.

Route in the forest, mostly dirt. Over long distances, the terrain can be heavy with numerous puddles during the wet season.

Saint-Pierre - Saint-Firmin Church
Dating from^{the 15th} and^16th centuries. According to legend, the church was built in 1212 by Pierre de Dreux, Duke of Brittany. Before going into battle, he vowed to build a church if he was victorious. To choose the location for the building, he had two oxen harnessed to a heavy cart and decided that the church would be built where the oxen stopped.

Le Tertre Guy
Le Tertre Guy was once a large estate. In the^17th century, it consisted of a noble house, a dovecote, the Chapel of Saint-François and the water mills of Le Tertre Guy and Le Gué Briand. The chapel, founded in 1639, was destroyed by fire in 1786 and was never rebuilt. The dovecote has disappeared. The watermill, which was still in operation in 1833, was destroyed. The manor house, which has been completely dismantled, retains only a few traces of the^17th century.

The ponds of the valley
Here you will find aquatic plants (irises, reeds, rushes, etc.), numerous insects and amphibians. In this natural space, it is possible to fish (if you have a licence) and picnic. You can also see Ouessant black-headed sheep.