Magnificent mountain lake lying in a gulley at the foot of the arête between the Pic du Jalouvre, the Buclon and the Aiguille Verte.
From the arête itself a wonderful view opens up over Lake Geneva, the Jura mountains and the Aravis range to Mont Blanc. The lake, at 1730 m, is on the Grande Randonnee no.96.
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. Camping 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.
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. Camping 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.
Rates
Rates
Free
Openings
Openings
From 15 May 2025 until 15 November 2025 - Open everyday
Accessible outside the snow season and subject to weather conditions. Check with the Tourist Office beforehand for current access conditions. Recommended season: spring - summer - autumn.
