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Marchamp can be reached by climbing from Lhuis or from Serrières-de-Briord, via Seillonnaz, then Lompnas. Park in the large shaded car park after the cemetery.
(S/E) Pass by the side of the cemetery, following the signs put up by the municipality. Go around it to take the Chemin de Luepe, which climbs uphill, with a sign prohibiting vehicles. Keep left at the three-way junction and continue to the hairpin bend.
(1) Leave the gravel path and go straight ahead onto another path that leads into the forest. There is a steep descent under the trees. Continue until you reach a four-way intersection.
(2) Take the gravel path on the right, which gradually descends (with occasional views of the Bugey and the Bauges) to Lac de Cerin, which is more of a peat bog due to climate change.
(3) Walk along the bog to reach the RD94a and follow it to the right for about 300 m, walking along the shoulder.
(4) Atthe first left turn, take the path that branches off to the right, slightly uphill under the trees: it can be very wet depending on the weather. It leaves the forest and comes out onto a meadow.
(5) At the edge of the meadow, look for a path on the left, which is not always clearly visible, in the bushes. Take this path, then turn right at thefirst intersection to reach the Cerin fossil quarry.
(6) Take the path that climbs up and leads to an information point about the site. Take the time to stop and explore this exceptional site. Set off again, skirting the quarry on the left, and you will soon reach a fork.
(7) Follow the path on the left, called "chemin des Carriers", which descends steeply and leads to the Cerin Palaeoecological Museum: take care when crossing the scree and descending in wet weather.
(8) Continue straight ahead at the fork and follow the signs for "chemin des Carriers": on the right, takethe first possible shortcut via the Cerin Museum, on the downhill path.
(9) Turn right, join the RD87 and follow it to the right towards the village centre. Pass the town hall and continue to the car park of the Paleoecological Museum.
(10) Go down to the left along Rue du Clos until you reach an old mill
(11) Cross the bridge over the Brive and go straight up the steep path to the hamlet of Vercraz.
(12) Turn right. At the crossroads, at the cross, continue left and then left again, staying on the track until you reach another crossroads at Prés Longin.
(13) Turn right and continue along a path that descends to the edge of the forest.
(14) Continue straight ahead on a downhill path to reach the viewpoint over the Chosas waterfall: be careful, the cliff is dangerous. To get the best view, you need to get close to two very exposed points at the very edge of the cliff, especially in wet weather. However, the Ruisseau d'Haute Roche is beautiful when the water is flowing.
(15) Return to the fork.
(14) Turn left to rejoin the path, marked in yellow, which descends to La Brive and the ruins of an old mill, after crossing the footbridge.
(16) Turn right onto a path that climbs up to the road coming from Chosas (Chemin du Grapillon).
(17) Turn right, walk along the fields and re-enter the forest. Continue straight ahead to rejoin the Brive and follow it. Cross a small wooden bridge over the Ruisseau des Grès to reach the magnificent Brive waterfall.
(18) Climb up to the left along the cliffs. Cross a small tricky passage on a rocky spur, then continue along the path to rejoin the Brive. Pass by the ruins of an old mill. During periods of heavy rain, two other waterfalls are visible from the path.
(19) Cross a bridge over a tributary of the Brive and go up a forest path. After several bends, you will arrive at the village of Marchamp.
(20) Turn right to follow the departmental road, cross the village and climb back up to the cemetery car park (S/E).
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