Pont Romain and Notre-Dame de la Gorge from Le Cugnon

From the Tré la Tête car park at the foot of Le Cugnon, the walk follows the valley track beside the Bonnant for about 1.3 km, then climbs on a path through the forest, in the Contamines-Montjoie nature reserve, to the clearing of Sololieu at about 1,480 m, the high point. A path then crosses the Rosière peat bog and drops to the Pont Romain, where the Bonnant torrent runs through a gorge and the tourist office points to the waterfalls. The Roman road leads on down through the forest, past a natural bridge, to the church of Notre-Dame de la Gorge, rebuilt in 1699, where the road up the valley ends. The way home follows the Bonnant through the Parc de loisirs du Pontet to the car park.

It is 8.7 km round with 338 m of ascent; allow about 3 hours. The grade is Moderate: a steady climb of about 320 m to Sololieu on narrow mountain paths, then a long descent on the Roman road and the valley track. The tourist office rates its version of the walk medium and gives 8.3 km, 421 m of 'dénivelé' (the page does not say whether that is ascent only) and 3 hours 30. Our line is a variant of its loop: the office's description climbs from the car park into the forest and traverses above the Pontet leisure park to Sololieu, where ours follows the valley track first, so allow the office's time.

The path up to Sololieu is steep and rocky in places, where it goes between rocks. Dogs must be kept on a lead in the nature reserve; its manager says dogs can harm ground-nesting birds and disturb wildlife and livestock. The tourist office lists the walk for 1 May to 15 November, subject to snow conditions; its separate listing for the Roman road gives 15 May to 15 October 2026, so look at the dates before a late-season visit.

The start is the Parking de Tré la Tête, which OpenStreetMap lists as free; the tourist office lists public toilets among the walk's facilities. It suggests taking the free shuttle to the Le Barattet Le Lay stop and walking along the road to the car park. The commune's shuttle page links only a summer 2026 and a winter 2025-26 timetable, so check that a shuttle runs on the day.

Route drawn by Global Adventurer along OpenStreetMap paths (© OpenStreetMap contributors, ODbL), with figures worked out from it. Check the forecast and the ground on the day: paths change.