Lac Sainte-Anne, Alpine lake at Ceillac, France.

Lac Sainte-Anne is an alpine lake in the Queyras range situated at roughly 2400 meters elevation, spanning about 9 hectares across the mountainside. A natural moraine formation acts as a dam holding back the water, which reaches depths of approximately 22 meters.

The lake lies in a basin hollowed by glacial overdeepening and closed by a thick frontal moraine; it has no outlet, and its water seeps through the permeable moraine dam. A chapel dedicated to Saint Anne was built on that moraine, and a pilgrimage has been held there every 26 July since the 17th century, linked to the rescue of two young shepherds.

A chapel dedicated to Saint Anne stands on the moraine above the lake. Since the 17th century a pilgrimage has been held there every 26 July, linked to the unexpected rescue of two young shepherds.

The marked trail from Chaurionde gains elevation steadily over a climb lasting around two hours through alpine terrain. Sturdy hiking boots and layers are essential, as weather at this altitude can shift rapidly without warning.

A June 2025 acoustic survey found the lake has two main basins and a maximum depth of 23 metres, with an underwater spring at about 20 metres feeding it. Its sediment layer is only 2 metres thick, suggesting a recent formation compared with Lac Miroir, 200 metres lower, which holds 8 metres of sediment.