Access: from Léoncel, take the D199 for about 9km 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 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 the right 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 Pas de Rouisse, a shepherd’s hut, a water reservoir (Pas d’Ambel), then climb up to point 1492 before descending to 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 woods. 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, to cross a wooded area and reach the Pierre de l'Ours.
(4) Leave theGR®®93and continue down the small path 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) branching 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 valley, it turns right and continues more or less level through the woods, becoming a small track. In the next valley, take the most well-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 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 into the woods, then rejoin the track you took at the start at Pas du Gouillot.
(1) Turn right to return to the Col de la Bataille (S/E).