12.5 km | 26 km-effort
Trails
roc des tours lac de lessy
Walking
Very difficult
Le Grand-Bornand,
Auvergne-Rhône-Alpes,
Upper Savoy,
France
7h 35min
No
mers les bains
Walking
Easy
Mers-les-Bains,
Hauts-de-France,
Somme,
France
7.3 km | 9.2 km-effort
2h 38min
No
lac de girotte lac noir
Walking
Difficult
Hauteluce,
Auvergne-Rhône-Alpes,
Savoy,
France
16.7 km | 29 km-effort
7h 2min
Yes