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Park near the Château du Belon fish traps on the right bank of this coastal river.
Yellow markings (not very visible)
(S/E) With your back to the car park, go back up the road you came in on, pass the campsite and go around the Trémeillour farm.
(1) Leave the road you arrived on by turning left onto the small road (signposted Questélan). Shortly afterwards, ignore the road on the left that leads to this place, then turn right onto the road near large farm buildings and continue straight ahead. Make a detour to see the Allée Couverte Arc Boutée de Kerantiec, which is unfortunately poorly maintained and partly overgrown (June 2025). Ignore another road on the right and arrive at an electrical transformer.
Off the beaten track
(2) Turn right and follow this small road between cultivated fields, continuing until you reach the old Coat Melen farm, which is currently being restored (dead end sign).
(3) Go around the hangar, continue along the farm track and you will come to a road.
GR®34 marked in white and red
(4) Turn right, follow this small road downhill towards a bend in the Aven and look for the start of a path as soon as the road starts to climb again.
(5) Turn left onto this path which runs along a cove and then joins the edge of the karstic cave.
(6) Ignore the steep path on the right (which you will take on the way back) and continue straight ahead to the Rosbraz marina on the left bank of the karstic cave (a beautiful spot for a break).
(7) Look across the river to Port de Kerdruc and, to the south, the silhouette of Château de Poulguin. Retrace your steps
(6) Turn left and follow the road straight ahead, cutting across the contour lines. Pass a staircase made of large logs and arrive at a road near an information sign.
(8) Turn right and follow this road, first downhill to the cove you passed on the way out, then uphill, ignoring the path you took on the way out (Coat Melen farm). Unfortunately, the edge of the karstic cave is not accessible on this section. Continue to the sign for "Anse de Coat Melen".
(9) Taking a slight detour from the GR®, turn right into the woods to descend to the Anse de Coat Melen, which offers another view of the karstic cave and its opposite bank.
(10) Retrace your steps to find the road and continue along the GR®.
(9) Follow the road to the right and, at the fork, turn right towards Anse de Goulet Riec.
(11) Descend to the left onto the coastal path overlooking the karstic cave. Continue south-east towards Pointe de Penquernéo, which marks the mouth of the Aven. In places, small passages allow you to descend to the water's edge. Beautiful view of Port Manec'h beach on the other side.
(12) Continue along the coastal path towards the right bank of the Belon, passing the remains of an old fort (1678) that was one of a series of forts built on the coast by Vauban. Caution: from this point until the end, the coastal path becomes much more uneven, alternating between ascents and descents over rocks that can be slippery in wet weather. Continue to the mouth of the Belon (view of Kerfany les Pins on the opposite bank).
(13) Walk back up along the right bank lined with maritime pines. Look out over a pretty cove (which seems tricky to access from the coastal path) and reach a new cove.
(14) Cross a small footbridge to bypass this wetland and arrive at the historic building of the first oyster farm, dating from 1864.
(15) Finish the route by walking along the tables set up for oyster tasting, turn left to descend to the port on the right bank and catch a glimpse of the other port of Belon, on the left bank in the commune of Moëlan-sur-Mer. Turn around and walk straight back up to the car park (S/E).
Visorando member
Easy 
