Grand réservoir de Vioreau

The Grand réservoir de Vioreau is a large artificial lake in Joué-sur-Erdre divided into two sections: the main lake and the smaller Petit Vioreau. It is surrounded by extensive forest and open shores that serve fishing, boating, swimming, and walking areas throughout the warmer months.

The reservoir was created in the early 1800s to supply water to the Nantes-Brest canal. The dam was completed in 1835 and the canal opened to navigation in 1842, ensuring a steady water supply for this important transportation route.

The lake draws locals and visitors who gather here for fishing, walking, or picnicking throughout the year. Its role has evolved from a functional water supply into a social meeting place where people connect with nature and with each other.

The lake is easily accessible by road with free parking available, and facilities include restrooms, showers, and a small snack bar. Picnic tables shaded by trees line the shores, and a walking trail circumnavigates the water for about two hours, offering a complete tour of the area.

The lake is home to rare fish species and serves as a resting place for migratory birds during their journeys. Visitors can observe species such as ospreys and other migrating birds here, making it a special spot for wildlife watching.