The IGN TOP 25 hiking map No. 3228 OT covers the following area: Oyonnax, Ain Gorge, Haut-Jura Regional Nature Park.
- Contour lines at 10-metre intervals.
- Detailed legend: vegetation, rocks, watercourses and more.
- Hiking trails are shown.
Municipalities covered: Oyonnax, Gorges de l'Ain, Saint-Hymetière-sur-Valouse, Salavre, Cornod, Montfleur, Courmangoux, Aromas, Vosbles-Valfin, Charnod, Verjon, Izernore, Ceyzériat, Drom, Bolozon, Nurieux-Volognat, Nivigne et Suran, Samognat, Villereversure, Grand-Corent, Sonthonnax-la-Montagne, Cize.
Places to discover: Haut-Jura, Lake Nantua, Montréal Forest, Bois de la Côte, Bois de Samognat, Oyonnax Forest, Bois de Tharlet, Mont du Couloir, Mont Nivigne, Mont Myon, Mont Burdey, Ain Gorge, Crans Castle, Bonmont Abbey, Carroz Hut, Sapins de Borsattaz, Saut du Day, Réclère Cave, Les Pralets Hut, Rochefort Hut, Signal de Roche d'Or, Trois Chalets Hut, Chalet de la Dent de Vaution, Orbe Resurgence.