Lake Sainte-Anne in the Hautes-Alpes department is a lake of glacial origin which, therefore, occupies a depression resulting from erosion by a glacier. This 22-acres (9 ha) lake is deprived of a spillway and is surrounded by a moraine (a pile of blocks and rock debris driven by a glacier) that forms a dam and retains its surface waters but does not prevent their infiltration in depth. The chapel dedicated to Sainte Anne built on the edge of the lake is the subject of an annual procession on July 26th.