Les Gorges du Trient Opening hours De mai à octobre. Suggestions Sorniot, lower lake This balcony trail offers a plunging view of the plain and a panoramic view of the Mont-Blanc and Grand-Combin mountains. Thermal water spring Rinse your face and hands with thermal water and feel the difference. Dufour fortifications Straying a little off the path, you will be able to discover all the fortifications of this strategic site.