The start and finish point is in the commune of Priziac, in the Lac du Bel Air car park.
(S/E) From the Lac du Bel Air car park, take the north-east access road, then turn right onto the D109, Rue du Bel Air, towardsthe Saint-Beheau Church and Auditoire de Justice.
(1) Continue straight ahead on the D109, Rue du Midi, until you reach a multi-way intersection at La Croix.
(2) Turn right onto the C5 towards the Chapelle Saint-Yves and follow it to Kergoat.
(3) Continue on the C5 to join the D790.
(4) Turn right, then left at the next intersection towards Le Trévoux d'en Bas (hamlet). Continue straight ahead, ignoring Saint-Germain (chapel) on your right, and you will soon reach the next intersection.
(5) Turn left (Rue de Pont-Mahé), then right (D121) towards the village of Langonnet. Pass the church and continue to No. 3, Rue Abbati Zu.
(6) Turn right onto Rue Fontaine Lapig, then left onto Chemin de l'Étang, and continue to the next intersection.
(7) Leave the paved road and turn right onto the path to reach the Étang de Pontigou. Go around it on the right, then rejoin the road on the right after the playground.
(8) Continue left until the next fork.
(9) Keep right, then stay right until you reach the Tumulus de Kermain.
(10) Turn right, then immediately left onto the path and continue straight ahead to quickly reach La Motte Castrale.
(11) Continue along the road until you reach the crossroads at Pont Champeau.
(12) Take the hairpin bend to the left just before the bridge, then 200 m further on, take the passage on the right to reach the Abbaye Notre-Dame de Langonnet.
(13) Turn right onto Rue de l'Abbaye de Langonnet, leave the enclosure and arrive at a multiple intersection.
(14) Ignore the departmental roads and turn right onto the small road parallel to the D790. Continue straight ahead until you reach the end of the long Kerchampeau building.
(15) Turn left onto Chemin de Kervidio and continue straight ahead until you reach a junction with a small grassy central island.
(16) Turn left (Route de Lieven), then right (D109), and arrive at a four-way junction. Continue left, Route de Bonnével, towards Le Samedy, until you reach a three-way junction.
(17) Keep right (Route de Bonnével), then turn right at the next intersection.
(18) Near Bonnével, turn left, then quickly right, and follow the road. Pass Kervenac'h and join the next road on the left, at the edge of the woods.
(19) Take this road and, at the next intersections, turn right until you reach a road.
(20) Continue left (D109) for about 140 m, then take the cycle path on the right, which runs alongside the road, and join the Lac du Bel Air car park (S/E).