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Start from the car park downstream of the Moulin de Pen Mur dyke. From the village of Muzillac, follow the signs to the site.
(S/E) With your back to the dyke, take the footbridge on the right-hand side of the access road. Then cut across the valley to reach the other bank of the Ruisseau de Saint-Éloi. At the end of the footbridge, turn right onto the path that goes around a rocky outcrop, then climb up to the left to reach the road leading to the mill.
(1) Cross this road and turn right onto Allée de l'Étang. Follow this road for about 100 metres, then turn left at the "private property" sign. The path, which runs under the canopy of trees, curves to the right and leads to the first viewpoint over the lake. On the right, at the tip, you will see Pen Mur Castle. Continue along this path until you reach a fork.
(2) Leave the path straight ahead and take the descent to the right, which leads to the water's edge. Follow the shore to the next bend in the lake, then enter the valley that climbs up to the left.
(3) About a hundred metres from the water's edge, turn right to reach the bottom of a tributary valley. Cross the footbridge, then return to the right by climbing up the slope. You will reach a magnificent viewpoint overlooking the first bends of the lake.
(4) Go around the wooded ridge, following the trail through the pine forest. First following the upper edge of the woods, it then descends towards the bank and runs more or less parallel to it. The trail then curves widely to the left, while the flooded valley widens.
(5) As you approach a narrowing in the terrain, the path runs along a rock face that appears to be an old quarry face. The terrain here is quite rugged and some sections require a little caution. Go around the bend and climb up the narrowest part of the pond, still following the bank as closely as possible.
(6) After a left turn, ignore (or not, see below) the access to the riverside route and start climbing the slope, cutting through the woods. Cross two forest paths before reaching the upper edge of the woodland. Follow this edge for about 600 metres before descending into a small valley where a wide path runs. Continue on the right, parallel to the path, until you reach the footbridge that crosses the Kervily stream wetland.
(7) At the end of the footbridge, turn right, climb the winding path up the hillside, then follow the fences of the riverside properties. The path eventually leads to the road that serves the hamlet of Kerguest. Turn right twice to descend towards the Chapelle du Moustéro, visible at the end of the long wooden fence that runs alongside the access road.
(8) Reach the chapel after crossing the grove that separates it from the road. This small 11th-century building overlooks the tail end of the pond above the confluence of the two streams that feed it: the Saint-Éloi and the Kervily.
Pass in front of the chapel and go around the right side of the meadow that separates it from the pond. Go up the bank to the left, via the wooden walkway, and return to the road, just before the Moustéro bridge. At the road, turn right and follow it to cross the bridge. A few dozen metres further on, leave the road and take a path that descends towards the bank. A little further on, this path begins to climb the rock where a platform has been built, overlooking the entire upper part of the pond.
(9) Leaving the platform, continue along the path which climbs before descending again towards the riverbank. Cut across the point which marks the sharpest bend in the pond, cross a recently planted area and reach the bottom of the cove where the valley below Tréhourien ends.
(10) Cross the footbridge over the wetland at the bottom of the cove and continue along the bank to reach the Saint-Éloi stream. The route continues along a path with little shade that runs alongside neighbouring farmland.
(11) Take the steps leading up from the bank to the plateau, then turn right to descend to the edge of the pond. Stay on this path to go around the Laluisso peninsula, which you can also cut across to reach Laluisso directly and continue on the trail.
(12) At this point, take the double bend that precedes the Moulin de Pen Mur. The castle watches over the opposite bank as you continue up towards Laluisso. At the bottom of the flooded valley that precedes this village, pass a house on the right with its "feet in the water" and go around the hamlet.
(13) When you reach the road leading to the houses, take the path on the right and descend into the damp valley to go around it. Return to the main course on the opposite bank, from where you can better appreciate the property glimpsed on the other side. After reaching the point where this secondary stream meets Le Saint-Éloi, cross another stream, then climb vigorously up the opposite rocky slope. Reach the highest viewpoint of the entire route, from where you can see the first bends of the Saint-Éloi valley.
(14) Follow the path that runs along the top of the rocky hill overlooking the dam and the Pen Mur mill, then continue slightly to the left at the mill. The roughly maintained path winds its way through rocky escarpments, which can be slippery in wet weather.
(15) Follow this path to a stone cross and turn right to descend a staircase that leads to the access road to the mill. Go up to the right for about a hundred metres to return to the car park (S/E).
Visorando member
Easy 
