Plan d’Eau Biotope (COMBLOUX)

[ autumn 2021: a new plan d’eau is to take the place of the old one, with a chantier started already! The old plan d’eau was 20 years old, and had received 280 000 swimmers over the years! The new structure will have a lake of 1750m² (max depth 2.60 m), with an area dedicated to sports swimming (4 lanes) ]

A visit to the 💦 Plan d’Eau Biotope in Combloux makes for a wonderful day of swimming and lazing, with 🏔 a majestic view of the Mont-Blanc Massif as a backdrop!

Combloux boasts the 💦 first ecological mountain lake in France, in the most superb setting. The lake was created for swimming and has more than 🌱 10 000 aquatic plants filtering the water in order to purify it; this ensures an optimal water quality, without the use of chemicals or chlorine. Naturally heated by the ☀️ sun, the water temperature varies from 19°C to 26°C, so grit your teeth and enjoy! There is also a pretty 💦 waterfall feature, and with a backdrop of 🏔 Mont-Blanc, this is one of the prettiest spots 🏔 au Pays du Mont-Blanc!

Lac Biotope, Combloux
Plan d’Eau Biotope in Combloux ©
Plan d’Eau Biotope © Combloux Tourisme

More information about the lake
  • 🌳 shade – there isn’t much in the way of shade at the 💦 Plan d’Eau Biotope, but you can rent out parasols (5€, plus deposit) at the entrance / some people bring their own little tent shelters to keep small babies and young children in the shade;
  • swimming shorts are NO LONGER allowed for swimming; boys and men must wear a slip;
  • 🐶❌ dogs are NOT permitted;
  • 🚾 WC with changing tables and a place to warm baby food;
  • 🏊‍♂️ swimming lessons on request (3+ years);
  • 🧘‍♂️ there are often yoga sessions / pilates / Tai Chi at the 💦 Plan d’Eau Biotope (see Combloux Tourist Office agenda);
  • arm-bands can be rented (deposit of 5€);
  • 🏃‍♀️ there is a short walk with information panels all the way around the lake (perfect for buggy walks & baby snoozes!) / see below for more information;
Plan d’eau Biotope © Combloux Tourisme

Eating options

🍏 Picnics are allowed on the large green lawn (though you must use a picnic blanket!), and there is also a restaurant on-site: Le Dandy (address: chemin d’Arvillon, 74920, Combloux / tel: +33 (0)4 50 90 17 50). You are also a short walk from the centre of town, where you will find plenty more restaurants and boulangeries!

Le Dandy © Combloux Tourisme


There is a small roundabout on site, and just above the lake is the adventure playground, one of our favourite playgrounds (see MBFF’s article 🏔 Combloux Playgrounds au Pays du Mont-Blanc).

🛴 Louparc, pumptrack & skatepark and city-stade – a short walk from the 💦 Plan d’Eau Biotope, you’ll find a playground, a parcours freestyle, a skatepark & a city-stade (just next to the school), so be sure to pack your bikes, skateboards, scooters and balls! There is also a small playground next to the church, suitable for small children.

Combloux pumptrack © montblancfamilyfun
Combloux church playground © montblancfamilyfun

Other family activities nearby in Combloux

🍏 market – Combloux’s weekly market takes place on Wednesday mornings / address: 49, chemin des Passerands, 74920, Combloux;

🎶 concerts & summer activities – during the summertime, there are plentiful concerts and family activities on offer around the 💦 Plan d’Eau Biotope (yoga, pilates, Tai Chi . . .) and at Plan-Perret (the stage area next to the lake): 🎵 La Fête de la Musique, 🇫🇷 La Fête Nationale (14 juillet), 🎵 Le Festival Baroque, BBQs, family sports & games . . . the Combloux softplay La Tanière de Tilou is often set up for these events / see Combloux Tourisme for more information;

Plan d’Eau Biotope in Combloux, summer event ©

🧗‍♂️ boulder hopping – there are some great boulders right next to the 💦 Plan d’Eau Biotope! / there is also 🏐 a volleyball court nearby;

Boulders at the Plan d’Eau Biotope in Combloux in late autumn ©

🏃‍♀️ sports events – some big sports events take place in and around the 💦 Plan d’Eau Biotope:

  • 🏃‍♂️ La Comblorane (running, hiking, mini-trail and obstacle course for children / weekend 12th & 13th June 2021 / see website);
  • 🚲 MB Race (VTT event from 16th until 18th July 2021, with events for children – MB KIDS on Saturday 17th July 2021 (7 to 14 year olds / see here) and MB Draisienne on Sunday 18th July 2021 (for 2 to 6 year olds / see here);

🎾 tennis courts – Combloux’s three public tennis courts are located right next to the 💦 Plan d’Eau Biotope / there are stages offered during the summer months, see here / address: Plan Perret, route de Sallanches / reservations: 06 80 25 33 40;

🏃‍♀️ walks – there are some lovely family-friendly walks accessible in Combloux from the 💦 Plan d’Eau Biotope:

  • 🌿 « Balade 100% bio » loop around the 💦 Plan d’Eau Biotope duration: 30mins / possible with cross-country buggies / see here for more details;
Plan d’Eau Biotope in Combloux ©
  • 🧗‍♂️ « Sur les traces des Graniteurs » – a fabulous, informative walk on the trail of the old granite workers; 1h30 / this hike can also be done as a guided visit / see MBFF article here for more details;
Sur les Traces des Graniteurs ©
  • 🏚 « Balade Panoramique de Combloux » – up to the pretty village of Ormaret, and the ” sites remarquables de Combloux ” / duration: 2 hours / see here for more details;
  • ⛪️ « Petite balade sur le Sentier Baroque »duration: 1h30 / see here for more details;

[ see Combloux Tourisme website for some more ideas for family walks ]

Practical Information

🗓 opening hours 2021 season – from 12th June until 29th August 2021, every day from 11h to 19h (subject to change);

[ good to know – the entrance to the 💦 Plan d’Eau Biotope is limited to 700 entries per day, to enable the 🌱 plants to do their work, keeping the water clean! The opening hours are subject to change in the event of bad weather, or for cleaning purposes (the lake sometimes needs a rest!) ]

price: adults: 5€ / children (5-14 years): 4€ / children under 5 years: FREE!
adult season card: 50€ / child season card: 40€;
family card (12 entrances): 50€ (valid only for one summer season);

[ good to know – from 17h (if the lake is not at full capacity): 3€ for adults and 2,40€ for children ]

🎟 how to buy your entrance: 

  • 🎟 online – at (until 10h on the day of entry), from 2nd July 2018;
  • 🎟 at the Tourist Office in Combloux from 9h to 10h30;
  • 🎟 or directly at the 💦 Plan d’Eau Biotope from 11h onwards on entry day (MBFF always tries to get to the 💦 Plan d’Eau Biotope at about 10h30, to find a parking spot and to be first in line!);

🅿️ parking: just above the Plan d’Eau, in Parking des Cristaux, follow signs at entrance to Combloux;

address: Plan d'Eau Biotope, Plan-Perret, 74920, Combloux;
tel: +33 (0)4 50 58 60 32;
website: Combloux Tourisme

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