Park in the car park near the Kerigan Bridge, on the south shore of the lake.
(S/E) When you leave the car park, take the path on the right, heading east. Follow the lake on your left for about 1.3 km until you reach the dam.
(1) Take the steps on the left and walk along the top of the dam (view of the original valley floor with its waterfall).
(2) On the other side, turn left. Continue along the lake on your left and pass a campsite on your right. Walk along the lake for about 2 km until you reach the Pont de Perche bridge.
(3) Cross the bridge. On the other side, turn left onto the footpath closest to the water. You will soon reach the Pont de Kérigan bridge.
(4) Cross the bridge to return to the car park on the opposite bank (S/E).