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Establet is located on the D61 between Charce and Bellegarde-en-Diois. South of the village, turn east onto the D106 towards Saint-Dizier-en-Diois. After 1.5 km, at the end of the straight road, at the crossroads, you can park near the bins on the right, close to the altitude of 1059 m.
(S) Head 50m north to join the small road towards Col de la Caille (signposted).
(1) Turn right east-southeast. At the next crossroads (altitude 1095m), turn left (north) and continue along the wide path.
(2) Pass the houses on the left (Le Mas, 1153m), then the grave. Continue to a beautiful right-hand bend (altitude 1180m). There, facing you, the path climbs straight up the slope towards the north-east. A good, slightly steep climb brings you to Col de la Caille at 1299m.
(3) Continue straight ahead, heading east for about 250 metres, then a signpost on the right will show you the direction of the Crêtes de Tarsimoure.
(4) Take the path to the south-east, which climbs steeply, then a plastic-coated cable will help you continue along the ridge: it's tough going but you'll reach the summit fairly quickly. You'll come out of the climb at an altitude of 1484m.
(5) From there, follow the ridge. Yellow lines on the ground indicate the path to follow: be careful not to crush the flowers... You will soon find the marker at the summit at 1550m. Continue along the ridges, descending then climbing back up to the second summit (1502m). Descend again to a signpost marked "Crêtes de Tarsimoure" (1,425 m). Continue towards Ranc de l'Aigle on the marked path, leaving another path on the right and reaching an elevation of 1,300 m.
(6) The path swings to the north side of the ridge and descends towards the Col de Saint-Pierre (1092m). This descent is tricky, steep and slippery on leaves: walking sticks are recommended. When you reach the forest track, turn right, cross the pass to the south and continue along the track to the Col Layard (1077m).
(7) Turn right and follow the Brézès signpost. The path descends gently to the hamlet where, upon reaching the road, you turn right towards the west.
(8) Follow the new signpost indicating "Tarsimoure" on the right, heading south-west. Climb up the left bank of the Combe ravine on a pretty path through the pine trees.
(9) After about 1,200 metres, you have the choice of continuing straight ahead in the combe or turning left into the Combe Rioux (the choice shown on the route here). The two routes meet at the top.
After passing through a gate, which you should close behind you, you will arrive at Serre Martin or Marsin on the IGN map (marker).
(10) Turn right towards the north-east, then at the next marker, descend to the left to the hamlet of Les Bascoux where there is a spring.
(11) After the spring, turn right. Ignore the paths branching off to the left and right and rejoin the Col de la Caille on the path, which is gentle at first but then becomes steeper.
(3) Turn left and descend via the same path you took on the way up.
Visorando member
Moderate 
Easy 
