Go to the village of Sazos and park in the town hall car park.
(S/E) Pass under the Sazos town hall (840 m) and go up the first street on the left (red and white markings).
At the top of the street, pass behind the cross and the fountain and continue straight ahead to the right (signposted Grust).
(1) After seeing the restored mills of Sazos, follow the path that climbs left between the meadows. Sometimes paved and lined with low walls, the path approaches Grust.
(2) When you reach the D12 road, follow the tarmac road on the right (take care) until you reach the end of a hairpin bend, where the path resumes on the right.
(3) Below the church in Grust (fountain and viewpoint), go up the lane on the left towards the centre of the village. From the church square, go up the street opposite (wash house) and then, very quickly, take a paved lane on the right (handrail). After a water point, leave the GR®10 trail at the second right turn to reach a viewing platform (1,010 m).
From there, walk a few steps to the bend in the road and climb up it. At the end of the tarmac road, continue straight ahead on the path that enters the forest. At the first Y-junction, keep right on the almost horizontal path that crosses through the woods. After two ascending hairpin bends, you will reach a wide path that descends to the right. A footbridge allows you to cross the Ruisseau du Pont du Sac at an elevation of 1124 metres, then a path takes over on the other bank.
(4) Follow the road downhill for about 800 m. Just before a barn (lodge).
(5) Turn right onto a path. Cross the road below and continue downhill to a path junction.
(6) Turn right and head towards Viscos.
(7) Below the Grange aux Marmottes (hotel), on the square (850 m, market hall and fountain), take the street on the right for 50 m, then a short raised, tarmac passage, which quickly becomes a terraced path.
(8) Join a secondary road at the village exit: follow the tarmac road to the right for 200 m until you find the continuation of the path on the left (signposted Sazos). Follow it across the wooded slope, often horizontally, to return to Sazos.
(9) At the corner of a barn, you will come out near a playground. Continue along the wide path to return to Sazos (S/E).