Start from the Col du Logis de Paris, on the DN7 (car park; no trouble finding a parking space).
(S/E) Head west along the Font Freye track and immediately ignore a path branching off to the right.
(1) At the next junction, carry on straight ahead (ignore the track leading down to the left – this will be the return route). Stay on the track for about 1.2 km and ignore any side paths.
(2) At the cistern, carry on straight ahead and ignore another track on the right. Stay on the Font Freye track for a further 1.6 km or so.
(3) Turn left. The track, heading south, climbs and then descends.
(4) At the crossroads (water tank), turn sharply right. Follow the Marre à Trache track, which winds around a few bends.
(5) At the junction (water tank), veer left and leave a track on your right. Further on, pass another water tank then descend via a series of hairpin bends.
(6) At the next water tank, turn right. Follow the A8 motorway, which runs high up on the right. Just before the next landmark, note the ruins of a Roman aqueduct on the left.
(7) At the junction (water tank), turn right and cross the Reyran at the ford. Stay on the track which immediately turns left (do not take thefirst path signposted on the right). Cross the river at the ford again.
(8) Shortly afterwards, at a junction, take the sharp right-hand bend and pass under the motorway. Continue along the track which crosses a car park,
(9) Leave the track and take a path on the right. Head uphill to reach the dam site, just under a kilometre away.
(10) Return along the same route to the junction after the ford on the Reyran (water tank).
(7) Take the track opposite, heading uphill (east), and follow theGR®51(red and white markings).
(11) At the junction, turn left (let theGR® head off to the right).
(12) At a hairpin bend to the left, leave the track and take the path opposite. Walk up the Vallon de l’Avellan to the lake of the same name.
(13) At the T-junction, turn left and cross a ford. Immediately afterwards, veer right and follow the path closest to the lake. Walk along the right-hand side of the lake and begin your circuit in a clockwise direction. Ignore all paths branching off to the left.
(14) At the eastern tip of the lake, just before another ford, take a track on the left and head uphill. Stay on the track and ignore any side paths.
(1) At the junction you passed at the start of the walk, turn right and continue straight on to the pass and the car park where you started (S/E).