Lac d'Oô, Mountain lake in Haute-Garonne, France.
This body of water extends across 42 hectares at an altitude of 1,507 meters (4,944 feet), reaching depths of 67 meters (220 feet) in the French Pyrenees.
Previously known as Séculéjo until the 1800s, the facility received its current dam infrastructure in 1921 for hydroelectric generation purposes.
Painter Louis-François Lejeune documented this location in 1834, establishing it as a subject in French artistic representations of the Pyrenees mountain ranges.
The GR10 hiking route connects the Granges d'Astau parking facility to this destination through a one-hour walk on marked trails.
The facility holds 13 million cubic meters of water, supplying a 30-megawatt power station while maintaining habitat conditions suitable for trout populations.
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