Park in the car park at Médréac railway station, which is also the starting point for the two rail bike routes, one 6 km and the other 13 km.
(S/E) Head east on the disused railway line used for the rail bike route and follow it for 1.9 km to PN16 at a place called Le Bois Gérault, at the intersection with a tarmaced local road. Leave the railway line by turning left onto the tarmac road and continue for 180 metres until you reach the D220 (caution: busy road). Turn right
(1). After crossing the bridge and before the first houses on the right, turn left onto a small tarmac road. Immediately uphill, turn left onto a gravel path. A few metres further on, leave this path and turn left onto a sunken path through the woods. Ignore the path below near the Le Néal stream and continue through the woods for 350 metres before turning right to climb up to the gravel path.
(2) Turn right onto the gravel path, then immediately left onto the path that climbs uphill. On the climb, ignore the access to the pond on the left and continue straight ahead until you reach a small asphalt road near some houses. Turn left onto the tarmac road between the storage shed and the sprint cross field; it turns into a gravel path along the edge of cultivated fields.
(3) Leave this path when it turns right to climb between two fields, turn left to descend along the edge of the field until you reach the Ruisseau du Néal 200 metres below, after passing to the left of an electricity pole. Turn right onto the path along the edge of the stream and follow it for over 2 km. Along the way, take a look at the Gabillard cave, located on the right-hand side of the path.
(4) When the path opens onto a vast flat meadow, take the metal footbridge on the left that crosses the Néal and continue along the path on the right to reach the edge of the Étang de Néal. Walk along this pond.
(5) Turn left, then right, then left again before coming out higher up on the D25 road as it curves. Turn left, and 30 metres further on, take the sunken path that climbs up to a tarmac road near some houses. Take this road to the left for 50 metres, turn right onto another tarmac road and follow it until you reach the Lampouy megalithic site.
(6) Enter the site by going through the wooden gates. Walk across this part of the site to reach a sunken lane. Turn left onto it to reach a place called Le Chênot. Make sure you close any electric fence gates behind you.
(7) Continue along the tarmac road leading to Le Chênot, cross another tarmac road, then a second one, to reach the edge of the woods and take the path opposite leading to La Roche Tombelle.
(8) After the house on the left of the path, take a sunken lane that descends into the Néal valley. Follow it until you reach a place called La Ville au Marchand. Turn left onto the tarmac road leading to this hamlet. Follow it to the hamlet of Querrier.
(9) After passing the hamlet and before crossing the bridge over a small stream, turn left onto the path running alongside the last houses. Follow it, ignoring the two paths on the left, to reach a place called Le Bois Gesbert.
(10) After passing the first houses, take the tarmac road on the right leading up to the top of the hamlet. At the last houses, turn left and then right onto the stony path leading up to other isolated houses. Ignore the access to these houses and take the dirt track between the trees. Follow it to reach the D220 (caution: very busy road).
(11) Cross it to descend to a small car park opposite and enter a park on the right that is used as a campsite. Follow the gravel path on the right along a pond, now dry, to reach the campsite changing rooms. Go around them on the left to reach a footpath leading to the village of Médréac.
(12) Turn left onto this path, which runs alongside the cemetery and follows Rue de la Libération until you reach the church.
(13) Go around the church on the left. Opposite the church entrance, take Rue de l'Église and you will come out on Rue de Rennes. Go down this street, then cross it and turn right into Rue de la Gare, climbing up to the car park where you started (S/E).