L'Aiguille verte and Le Lac de Lessy

Beware of storms on the ridge. Alternative route possible to complete a loop with a return via the chalets of Mayse, Le Planay and the old village (elevation gain 1,100 m and 6½ hours). Lake Lessy is part of the Natura 2000 programme, which aims to protect remarkable environments. In terms of plant life, the lake is home to a very large population of alpine pondweed and a smaller population of thorny buttercup. In terms of amphibians, the lake has a colony of Alpine newts. In this context, swimming is strictly prohibited. The following are also strictly prohibited: - Camping. It is only permitted under the stars (i.e. without tents, tarps or other types of shelter) near the communal refuge at Lake Lessy, with the permission of the caretaker. - Campfires and outdoor fires, the use of stoves and barbecues. - Drones. - Slacklines. Fishing is permitted: 1 catch per day per fisherman, single barbless hook, natural bait or fly only. River permits are available for purchase at the Grand-Bornand Tourist Office.