Lac de Bastan supérieur, Mountain lake in Vielle-Aure, Hautes-Pyrénées, France.

Lac de Bastan supérieur is a glacial lake of 6.5 hectares in the Aure valley, in the commune of Vielle-Aure, Hautes-Pyrénées. It lies at 2,280 metres and reaches a depth of 28 metres. With the middle and lower Bastan lakes it forms a chain of glacial basins at the foot of the Pic de Bastan and the Pic de Bastan d'Aulon, which rises to 2,721 metres.

The area surrounding this glacial lake has served for centuries as grazing land for local pastoral communities, who used the water to tend their livestock during summer transhumance in the high Pyrenean valleys.

The three Bastan lakes take their name from the Pic de Bastan and the Pic de Bastan d'Aulon (2,721 m) at whose foot they lie. The upper lake is the highest of a chain of glacial lakes in the Néouvielle nature reserve, and its waters hold brown trout (Salmo trutta). Around the shore grow Scots pine (Pinus sylvestris) and mountain pine (Pinus mugo); look for black redstarts, citril finches and Pyrenean chamois.

Visitors can reach the lake by following the GR 10 trail from Lac de l'Oule or by starting from Artigusse parking area at 5,226 feet (1,593 meters) near Aragnouet, with the hike taking approximately two hours.

This lake forms part of a series of three connected glacial basins known as the Bastan lakes, where the reflection of Pic de Bastan on the water surface offers photographers and hikers memorable views throughout the day.