Lac d'Allos

Lac d'Allos. It is the largest high-altitude natural glacial lake in Europe, situated at an elevation of 2,227 meters within the core zone of the Mercantour National Park in the French Alps. The lake occupies a dramatic cirque carved by Pleistocene glaciers, surrounded by peaks such as Mont Pelat and is a significant hydrological feature feeding the Verdon river system. Its exceptional natural value led to its early protection and it remains a premier destination for alpine tourism and scientific study.

Geography and Hydrology

Lac d'Allos is located in the Alpes-de-Haute-Provence department, within the administrative region of Provence-Alpes-Côte d'Azur. The lake fills a deep glacial cirque on the north face of Mont Pelat (3,051 m), part of the Mercantour massif, with other notable summits like the Grande Séolane and the Tête de l'Encombrette defining its amphitheater. Its primary inflow comes from seasonal snowmelt and alpine springs, while its outflow forms the Torrent de l'Allos, which eventually joins the Verdon near Colmars-les-Alpes. The lake's basin is composed of crystalline rocks, primarily gneiss and granite, which contribute to the exceptional clarity and low nutrient content of its waters. This hydrological system is a critical upper catchment for the Verdon, which itself is a major tributary of the Durance.

Ecology and Environment

The lake and its immediate surroundings constitute a pristine alpine ecosystem protected under the stringent regulations of the Mercantour National Park and as part of the Natura 2000 network. The oligotrophic waters support a unique community, including the Arctic char (*Salvelinus alpinus*), a relic species from the last Ice Age. The surrounding slopes and pastures are habitats for emblematic wildlife such as the Alpine ibex, Chamois, Alpine marmot, and birds of prey including the Golden eagle and the Bearded vulture, reintroduced to the region via projects like Gypaète barbu. The flora is characteristic of the Alpine biome, with alpine meadows featuring species like Gentiana acaulis and resilient cushion plants above the treeline.

Tourism and Recreation

As a cornerstone of alpine tourism in the Southern Alps, Lac d'Allos attracts hikers, nature photographers, and fishing enthusiasts. It is a major waypoint on the long-distance hiking trail GR 56 and is accessible via a well-marked path from the Laus parking area. The nearby Chalet-Hôtel du Lac d'Allos provides seasonal accommodation and serves as a base for exploring the area. Popular activities include circumnavigation of the lake, ascents of Mont Pelat, and winter sports in the surrounding valleys, with the Pra-Loup and Le Sauze ski resorts located nearby. Visitor numbers are managed to minimize ecological impact in accordance with the principles of the Mercantour National Park.

History and Management

The area's history is intertwined with pastoral use, with summer grazing by herds from villages like Allos documented for centuries. Scientific interest in the lake began in the 19th century, with early studies of its glacial origins and unique fauna. A pivotal moment in its conservation was its inclusion as a central feature upon the creation of the Mercantour National Park in 1979. Management is jointly overseen by the park's authorities, the French Office for Biodiversity, and local municipalities. The lake was also historically stocked with fish, including trout, though current management prioritizes the conservation of native species like the Arctic char.

Access and Infrastructure

Primary access to Lac d'Allos is by road via the D908 to the hamlet of Laus, where a large paid parking area marks the trailhead. From there, a 45-minute walk on a wide, graded path leads to the lake. The site is typically accessible from late June to October, depending on snowmelt. Infrastructure is minimal to preserve the natural setting, consisting primarily of the trail, informational panels, and the seasonal Chalet-Hôtel du Lac d'Allos. The nearest towns with full services are Barcelonnette in the Ubaye Valley and Colmars-les-Alpes in the Verdon valley, both offering accommodation and access to regional transport networks.

Category:Lakes of France Category:Alpes-de-Haute-Provence Category:Mercantour National Park