Lac de Beaumont-sur-Oise

Lac de Beaumont-sur-Oise is a freshwater lake in the Val-d'Oise department north of Paris, used by local dive clubs as an accessible open water training site. The calm lake environment provides a gentle transition from pool training to natural conditions, with generally good visibility in the shallower areas. Beginners can practice their open water skills on sandy and silty bottoms, while more experienced divers enjoy exploring the lake's features during club outings. The site is particularly popular from spring through autumn, offering Parisian divers a nearby alternative to longer trips to the coast or quarries.