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Lac du Bourget

Coordinates: 45°44′N 5°52′E / 45.733°N 5.867°E / 45.733; 5.867
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Lac du Bourget
LocationSavoie, France
Coordinates45°44′N 5°52′E / 45.733°N 5.867°E / 45.733; 5.867
Primary inflowsLeysse, Tillet, Sierroz
Primary outflowsCanal de Savières, Rhône
Catchment area560 km²
Basin countriesFrance
Max. length18 km
Max. width3.5 km
Surface area44.5 km²
Average depth85 m
Max. depth145 m
Water volume3,600 mio m³
Residence time8 years
Surface elevation231.5 m
SettlementsAix-les-Bains
Le Bourget-du-Lac
Brison-Saint-Innocent
Conjux

Lac du Bourget (Lake Bourget), also locally known as Lac Gris (Grey Lake), is a lake at the southernmost end of the Jura Mountains in the department of Savoie, France. It is the largest and the deepest lake located entirely within France.

The largest town on its shore is Aix-les-Bains. Chambéry, the capital of Savoie, lies about 10 km south of the lake. It is mainly fed by the river Leysse (and other small rivers), and drains towards the river Rhône through the Canal de Savières, an artificial channel. It is a Ramsar site. The extinct bezoule was found only in this lake.

The lake was formed during the last period of global glaciation in the Alps (Würm glaciation) during the Pleistocene epoch. It has a surface area of 44.5 km2 (4,450 hectares). The long and narrow north-south axis of the lake extends 18 km in length, and ranges between 1.6 km and 3.5 km in width.[1] The lake's average depth is 85 m, and its maximum depth in 145 m.

The lake is bordered by the steep summits of the Mont du Chat and the Chaîne de l'Épine on the west, and Bauges Mountains on the east, which form its shores.

Lac du Bourget was made famous by several romantic poems of Alphonse de Lamartine, including Le Lac,[2] as well as by descriptions by Xavier de Maistre, Honoré de Balzac, and Alexandre Dumas.

Panoramic view from Nivolet peak. Chambéry Airport is visible on the left, at the southern end of the lake, and Aix-les-Bains on the right

References