If you go through the Haute-Loire (43), that you stay at Puy, historic and beautiful city…read moregeological sius not miss any pretext to push the lake du Bouchet, 25 km. The lake du Bouchet is a circular lake of volcanic origin to 1200 m. Around the circle of water a striking blue, trees of a dark green. In short, this is wonderful. The autumn when it begins in the sweetness for me is the best time because c'st weather more suited to meditation or tasting walking around the lake (3 km). In summer, swimming, very little for me, water is icy, depth reached 30 m and the sun is hidden too! Winter is the test and the walk is short-lived.