The lake was created approximately 4,000 years ago by a landslide that blocked the local river flow.
The water depth varies significantly, reaching a maximum of 19 meters in certain areas.
It is locally referred to as the 'Emerald Lake' due to the specific reflection of the surrounding coniferous forests.
The lake features a unique ecosystem that supports protected species like the Alpine newt.
The water temperature in summer typically ranges between 17°C and 23°C.
A series of underground springs feeds the lake, maintaining its water levels throughout the year.
The site hosts a specific equestrian centre that operates throughout the warmer months.
Lac de Montriond is the third-largest lake in the Haute-Savoie department, formed by a massive rockfall from the Nantaux mountain. The lake features a distinct turquoise color caused by mineral deposits and its relatively shallow depth. A flat, 3-kilometer loop trail circles the perimeter, accessible to pedestrians and cyclists. During summer, the lake is zoned for swimming with designated lifeguard areas. In winter, the lake surface freezes, though ice skating is subject to local safety regulations. The surrounding terrain includes steep, pine-forested slopes that lead toward the Ardent waterfall. It serves as a natural reservoir for local biodiversity and is popular for kayaking and paddleboarding. The location remains one of the primary natural landmarks within the Portes du Soleil ski area.
The northern edge of the lake looking south, capturing the reflection of the cliffs in the water.
Carry a headlamp if walking the loop trail during late afternoon, as the surrounding mountains cause the valley to fall into shade early.
Bring water shoes, as the lake bottom near the shore transitions from gravel to smooth pebbles.
Use the designated picnic zones rather than the meadow areas to help protect the local flora.
Attempting to walk on the frozen ice during winter without verifying that local authorities have officially opened it for skating.
The road access may occasionally close during heavy winter snowfall for safety; the lake is accessible year-round otherwise.
Respect the 'no swimming' zones in the ecological reserve area at the northern end of the lake.
