Lac de Castet is a
lake
A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...
in
Pyrénées
The Pyrenees (; es, Pirineos ; french: Pyrénées ; ca, Pirineu ; eu, Pirinioak ; oc, Pirenèus ; an, Pirineus) is a mountain range straddling the border of France and Spain. It extends nearly from its union with the Cantabrian Mountains to C ...
,
Pyrénées-Atlantiques
Pyrénées-Atlantiques (; Gascon Occitan: ''Pirenèus Atlantics''; eu, Pirinio Atlantiarrak or ) is a department in the southwest corner of France and of the region of Nouvelle-Aquitaine. Named after the Pyrenees mountain range and the Atlant ...
,
France
France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
. At an elevation of 423 m, its surface area is 0.4 km².
Lakes of Pyrénées-Atlantiques
{{PyrénéesAtlantiques-geo-stub