Lac de la Liez, Water recreation area in Orbigny-au-Val, France.

Lac de la Liez is the largest of the four supply lakes for the upper reach of the Canal entre Champagne et Bourgogne, east of Langres in Haute-Marne. Its 290-hectare surface has 14.2 km of shoreline, and a 459-metre dam holds back 16 million cubic metres, with a maximum depth of 18 metres. Wooded hills and grassy slopes border the water, with the village of Lecey on the east shore.

Construction of the dam began in late 1881 and was completed in 1886, creating a reservoir of just over 270 hectares holding 16 million cubic metres. At the time it was the largest artificial lake in France. It is the largest of the four supply lakes for the upper reach of the canal between Champagne and Burgundy.

The departmental leisure and outdoor base on the shore is where sailing and windsurfing take place, and pedal boats and licence-free electric boats can be hired. Anglers come mainly for pike and carp, and water skiing is also practised on the lake.

The D284 runs along the lake's western shore and leads north to Peigney; the village of Lecey lies on the eastern side. The dam itself is 459 m long, and the shoreline measures 14.2 km, so allow time to move between the beach area and the sailing base.

The lake is the largest of the four supply reservoirs for the upper reach of the Canal entre Champagne et Bourgogne. Its dam, 459 metres long, was built between 1881 and 1886; at the time the 270-hectare reservoir was the largest artificial lake in France.