After Villelongue, continue towards Ortiac along a winding, very narrow road with few places where vehicles can pass each other. Drive through this small hamlet along a mix of road and track until you reach, at the edge of the woods, an area that can be used as a car park. If parked neatly, five to six cars can fit. Please note that this spot is very popular. If it is full, turn back and try to park 900 m further back, next to the Ortiac chapel.
(S/E) Head east and follow the track uphill for about 200 m.
(1) When the track bends sharply to the right, leave it and take a path on the left that descends steeply. Cross the Ruisseau d’Isaby and climb up the opposite side. Then turn right to reach the ruins of Saint-Orens Abbey.
(2) Leave the ruins on your right and continue the climb towards Lac d’Isaby, heading east but with a few bends.
(3) Join the track you left at the start of the walk, follow it as it continues (due east) and pass the hamlet of La Prade. Continue following the Ruisseau d'Isaby upstream for about 550 m.
(4) Turn off to the right to climb up to the beautiful Paspich Waterfall.
(5) Return to the main track.
(4) Follow the track to the right (when returning from the waterfall). Continue the ascent heading east-northeast then north-east to a viewpoint overlooking the Cascade du Pradets, below on the left.
(6) Continue the climb along the track, heading north-east then east. After a long walk, you will reach a small, unnamed lake.
(7) Then turn left, head south-east and reach Lac d’Isaby (a good spot for a break).
(8) For those who wish, turn left (north-east) and climb up to the Cabane Picourlet (an extra effort recommended for shelter in bad weather).
(9) Return via the same route, in the opposite direction, to the car park at the start (S/E).