Access: from Léoncel, take the D199 for about 9 km to the Col de la Bataille, where you can park at the side of the road after the tunnel.
(S/E) Follow the track (GR®®93) which runs horizontally to the right, heading south, at the foot of the Roc de Toulau.
(1) At the Pas du Gouillat, at a left-hand bend, leave the track (GR®®93) and continue due south along the path that follows a fence, towards “la Tête de la Dame” and “Les Sarnats”. Pass the Croix d’Ambel, leave the path on your right heading towards Omblèze and continue to the Tête de la Dame (1,506 m).
(2) Continue to follow the ridge and ignore the paths leading into the park. Pass the Pas de Rouisse, a shepherd’s hut, a water reservoir (Pas d’Ambel), then climb up to point 1492 before descending to the Pas de la Ferrière, the western end of the walk marked by a fence and a gate.
(3) Turn almost completely round, taking the path (GR®®93) heading south-south-west, which runs horizontally along the edge of the woodland. Ignore the path branching off to the left (dotted line on the IGN map) and continue a little further down the slope towards the west, crossing a wooded area to reach the Pierre de l’Ours.
(4) Leave theGR®®93and continue along the small path downhill, below the Pierre de l’Ours, through the woods. Cross a track and descend to the Tubanet refuge.
(5) Follow the track due south for about a hundred metres, then rejoin the path (GR®®93) which branches off to the right through the woods. Further down, this path reaches the Ambel mountain pastures, enters the park and follows the edge of the woods. Halfway up the slope, after the small valley, it turns to the right and continues more or less level through the woods before becoming a small track. In the next small valley, take the most clearly marked track branching off to the right (GR®®93) as it climbs. Reach the Ambel refuge by continuing straight on when you reach the next small valley.
(6) Continue along the path (GR®®93) that you left to go to the refuge. Pass the water trough used to water livestock, head back up through the woods, then rejoin the track you took at the start at the Pas du Gouillot.
(1) Turn right to return to the Col de la Bataille (S/E).