(S) The entire route is signposted in yellow and purple, with a few additional directional signs.
Park on Place Guichard, near the station.
(1)Cross the River Albarine via the footbridge. Continue straight on along Rue de la Grenette, cross the D1504 and carry on straight until you reach a steep flight of steps (route sign). Follow the steps; at the top, turn left onto the tarmac road for a few dozen metres, then turn right (sign). Climb up a narrow, steep path until you reach a wider track; turn left and carry on until you can see a meadow on your left.
(2) Cross this meadow to the entrance of the Cornillon site (the first castle), which features a few information boards.
As you walk, near the ruins, head to your left and take a narrow, fairly steep path that skirts the base of the site until you reach a tower topped by a statue of the Virgin Mary.
Turn right until you reach the tarmac road, then continue uphill until you see the sign on your left indicating the start of the narrow path that descends to the Le Brevon stream.
(3) Cross this stream. This is the site of Saint Rambert’s martyrdom. Turn right to walk up a shaded path until you reach a tarmac road. On your left (50m away, you’ll find the crypt of Saint Domitien). Visits are possible if you contact the Sisters of the Abbey in advance.
(4) Turn left onto the tarmac road leading back down towards the town centre. You’ll pass close to the cemetery. When you reach the bottom of this road, you’ll see a metal barrier (sign) in front of you. Turn right; you’re now on a tarmac road that climbs for several kilometres towards the hamlet of Angrières.
(5) There are two short detours off the road: the first at a place called Périne on the right, and the second after passing the Rochers de Talourd cliff, also on the right.
(6) Join the tarmac road on the right and follow it for a few hundred metres until you reach a farm track branching off to your left (signposted)
(7). This track begins with a long, straight uphill stretch; at the end of this, turn right, following the signposts. You are now in an area of pastureland, and the track continues, zigzagging through the countryside. After a few hundred metres, you’ll enter a wooded area; follow the signposts until you reach a clearing in the forest beneath a high-voltage power line (sign).
(8) Pass under the high-voltage line and take the well-marked forest track, which curves through a coniferous forest for 2 to 300 metres. At the bottom of the descent, turn left onto another, less well-marked track for about 50 metres; this leads to a wide path that crosses the previous one at an angle of approximately 90°.
Follow this path until you reach a sharp bend to the right (marked by a permanent large puddle). Immediately afterwards, take the path that descends steeply to the right in a straight line.
(9) At the bottom of the descent, turn left onto a wide path that is almost level at first, then descends slightly to a flat area (marked by a hunters’ hut surrounded by metal sheeting). Continue to the right along a well-marked path downhill for just over 100 metres. The path then climbs slightly to the left (northwards) to go round the hill, heading west, then south-west.
(10) It then joins theGR®59, which comes in from the right. On your left, you’ll see a recently cleared area and a large meadow.
Continue the descent along a stony farm track until you reach the ruins of Saint Germain Castle. These are open to visitors (there are information boards and/or members of the heritage society present at weekends).
The walk continues down through the pointed archway (a narrow, steep path) until you rejoin theGR®59route. Turn left onto theGR®59route as far as the Tour de Gy (private property). (12).
(13) Turn right and continue to a water reservoir. Just before it (a few metres away), turn left towards the hamlet of Saint Germain. When you reach the first houses, turn left towards a chapel (downhill).
(14) At this chapel, turn left into Rue de la Tour or Rue de la Reine Clotilde and head downhill to a car park situated on a former section of the D1504 (there is a British coach there) (E).