Lac d'Oô, Mountain lake in Haute-Garonne, France.
The lake stretches across 42 hectares at an elevation of 1507 meters, reaching depths of up to 67 meters in the French Pyrenees.
Originally named Lake Séculéjo until the 19th century, the current dam structure was completed in 1921 to generate hydroelectric power.
Painter Louis-François Lejeune captured the lake's landscape in 1834, contributing to its early artistic documentation in French mountain scenery.
The GR10 hiking trail leads visitors from the Granges d'Astau parking area to the lake through a one-hour walk on marked paths.
The lake functions as a 13 cubic hectometer reservoir, powering a 30-megawatt hydroelectric plant while supporting local trout populations.
Location: Haute-Garonne
Elevation above the sea: 1,507 m
Address: Lac d'Oô, 31110 Oô, France 31110 Oô 31110 Oô
GPS coordinates: 42.74000,0.49200
Latest update: July 1, 2025 14:43
The lakes of Occitanie, located between the Pyrenees and Massif Central, consist of both natural and artificial water bodies. The natural lakes are mainly found at high altitudes in the Pyrenees, formed by glacial activity. The artificial lakes, created by dams, serve as water reservoirs and host water activities. This region features notable lakes such as Salagou with its red rocks, Lac d'Oô with its 300-meter waterfall, and Lac de Gaube facing Vignemale.
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