Discovery lake

With 4,800 hectares of water at its highest, Lac du Der requires skilful management to ensure that it operates correctly throughout the year.

4,800 hectares of water at its highest

Lac du Der in facts and figures :

• 4,800 hectares of water
• 350 million cu. metres (i.e. 100 days of water consumption for the Ile de France region)
• 77 km of shoreline
• 10 km long and 5 km wide
• 15.4 km of channels
• 18.2 km of dikes

10 000 hectares of water for a double mission.

Who is responsible for management ?

Lac du Der belongs to the Institution Interdépartementale des Barrages-Réservoirs du Bassin de la Seine (www.iibrbs.fr),a public body operated jointly by 4 départements - Paris, Hauts-de-Seine, Seine-Saint-Denis and Val-de-Marne.