The swimming pool uses a phyto-purification system involving specific aquatic plants and a gravel filter to maintain water quality without chlorine.
The lake was created by damming the Reins river, a tributary of the Loire basin.
The site encompasses approximately 400 hectares of surrounding woodland managed as a forest park.
The biological pool covers an area of 8,000 square meters, making it one of the largest of its kind in Europe.
The base is equipped with a specific drainage system to prevent silt buildup from the Reins river during heavy rainfall.
Lac des Sapins is a 40-hectare artificial lake located in the Beaujolais region of France, recognized for its large biological swimming pool. Opened in 1995, the site features one of the largest natural, chemically untreated swimming basins in Europe, which uses plants for water filtration. The lake is surrounded by 400 hectares of forest, providing extensive trails for hiking, mountain biking, and trail running. Recreational facilities include a mini-golf course, a treetop adventure park, and a nautical center for pedal boats and sailing. The site is a prominent destination for camping, offering various pitches and rental accommodations. Visitors can utilize the on-site snack bars and restaurants during the peak season. The lake is situated within the commune of Cublize, situated in the hilly landscape of the Monts du Beaujolais. Water quality is monitored regularly to ensure the safety of the biological filtration system.
The wooden boardwalk surrounding the biological pool during golden hour.
Check the official website for real-time water quality status and potential capacity limits before arrival.
Bring water shoes, as the biological pool bottom is composed of gravel and rocks rather than artificial tiles.
Book accommodation well in advance if visiting during July or August, as campsites reach full capacity quickly.
Do not attempt to swim in the main lake area; only the designated biological pool is authorized for swimming.
The biological swimming pool is seasonal, typically opening from early summer through the end of August.
No soap or sunscreen containing harsh chemicals is permitted in the biological swimming pool to protect the plant-based filtration system.
