Lac de la Vierre, Belgian lake

Lac de la Vierre is a 35-hectare reservoir on the Vierre, a tributary of the Semois, south of Suxy in the Chiny area of Luxembourg province, Belgium. Its concrete dam, 134 m long and 12 m high, holds back 1.5 million m³ of water in the forest of Suxy. A smooth grey sheet of water stretches to a wooded shoreline.

Construction of the reservoir began in 1963 and took two years, with crews blasting an 827 meter underground gallery. The project was designed to harness water power for electricity generation while creating a recreational space for the region.

The lake takes its name from the Vierre river, one of the waterways that feeds it. The shores have become a gathering place for fishers and walkers seeking quiet time in nature.

The lake is easily reached on foot with walking paths around the shoreline for leisurely strolls. Visitors should wear sturdy shoes and be prepared for variable weather, especially during early morning or evening hours.

The 827-metre horseshoe-shaped gallery, 2.4 metres in diameter, was bored through the rock of the hill separating the Vierre from the Semois, dropping 23.5 metres to the power station. It diverts a flow of 10 cubic metres per second from the Vierre. The dam itself, 134 metres long and 12 metres high, was built between 1963 and 1 March 1965 at a cost of 60 million Belgian francs.