Lake of Tremelin

Need to clear your head, get away from it all, take the kids out or just relax in the forest? Then head for Lac de Trémelin in Iffendic! Just 30 minutes from Rennes and at the gateway to the Forêt de Brocéliande, Lac de Trémelin is a small, unspoilt corner of moorland and forest, where you can stroll, sunbathe, take a dip, relax, discover art exhibitions and take in the scenery.From April to September, there’s accrobranche, water sports and a whole host of other activities on offer… In July and August, swimming is open and authorised from 1.30pm to 7pm every day! A great way to cool off…

Epée Lac De Trémelin Broceliande en Bretagne — ©Office de Tourisme Montfort Communauté

Plage du Lac De Trémelin - Brocéliande - Bretagne — ©Emmanuel Berthier

Famille au lac de Trémelin — ©Emmanuel Berthier

An unspoilt site in the heart of the forest

Lac de Trémelin is a 50-hectare lake set in 220 hectares of forest and moorland. In summer (July/August), there’s a fully equipped beach where youngsters can splash around in the 20°C water, while older children can take advantage of the diving platform. The supervised beach and excellent water quality have earned Lac de Trémelin the Blue Flag label. You can also try your hand at fishing. To be in order, buy your fishing licence (or go to the tourist office on the lakeside).

Download the map of the lake117KB

Outdoor activities For all the thrills!

For moments of pure relaxation with family or friends, Lac Lac de Trémelin is the ideal place to enjoy a range of leisure activities. Whether you’re looking to challenge the lush green peaks with an accrobranche (tree-climbing) adventure, sail peacefully on the waves in a pedal boat or canoe / kayak, ride a horse, or challenge your friends to a game of beach volleyball or pétanque, Lac de Trémelin offers a range of activities where everyone can find something to suit them, in a natural setting…

Tree climbing
If you’re a thrill-seeker, take a stroll from branch to branch along the various accrobranche courses opposite the lake. Adrenalin guaranteed!
Since April 2025, something new and exciting has been waiting for you: the adult courses now end with a series of three consecutive zip lines, two of which are over 200 metres long. Imagine flying over the lake, the wind in your hair, with a breathtaking view of the surrounding forest. Adrenalin and wonder guaranteed!
- Giant zip lines over 200m long – From 11 years old: €9
Any questions?
Contact Aventur’O Lac on 06 31 34 09 28 / aventurolac@montfortcommunaute.bzh / www.lacdetremelin.com
Nautical activities
Take to the water in one of the many boats available: canoe, kayak, pedal’eau. You’re guaranteed freedom and a great time together.
- Pedal’eau – 30 min: €7 for 2 places
- Pedal boats – 1 hour: €12 for 2 places
- Water pedal – 30 mins: €12 for 4 people
- Water pedal – 1h: €19 for 4 people
- Canoeing and Kayaking – 1h: €11 for 2 people
- Canoeing and Kayaking – 1h: €7 for 1 person
Any questions?
Contact Aventur’O Lac on 06 31 34 09 28 / aventurolac@montfortcommunaute.bzh / www.lacdetremelin.com
A la carte activities
Aventur’O Lac also offers other à la carte activities:
- Mini-car: €2.5 per token for children aged 3 and over
- Mini-golf: €5 for over-12s / €3 for 5-12s / 100% free for toddlers
Any questions?
Contact Aventur’O Lac on 06 31 34 09 28 / aventurolac@montfortcommunaute.bzh / www.lacdetremelin.com
Horse riding
The equestrian centre at Lac de Trémelin offers rides for adults and children alike, whether you’re an expert or a beginner!
- 30-minute pony ride: €15
- 1-hour pony or horse ride: €30
Information and booking required on 06 32 56 64 09 / 02 99 09 77 92 / www.lacdetremelin.com
Lake fishing
You can try your hand at fishing. All you need is a fishing licence, which you can obtain online (annual, weekly or daily licence). Don’t hesitate to collect your fishing permit from the tourist office and find out about the specific rules for fishing at Lac de Trémelin…
Do you have any questions?
Contact the tourist office on 02 99 09 06 50 / tourisme@montfortcommunaute.bzh / www.lacdetremelin.com
Relaxation areas
Lac de Trémelin also has a number of relaxation areas where you can spend some unforgettable moments with family and friends. Table tennis, petanque, möllky, shuffleboard, yoga area, book box, play areas… You’re bound to find your own little corner of paradise here…!
Do you have any questions?
Contact the Tourist Office on 02 99 09 06 50 / tourisme@montfortcommunaute.bzh / www.lacdetremelin.com
Eating and sleeping by the lake
Lac de Trémelin offers the possibility of eating on site and spending a few days at the campsite or in the gîte village.
The restaurant / brasserie / bar :
The Lac de Trémelin restaurant, with a capacity of 100 covers, and its terrace, are ideally situated on the water’s edge, offering a magnificent view of the lake! Every week, the chef prepares a variety of menus, presented on a slate. Whether it’s for a business meal, a seminar, a birthday or a family gathering, the Brocéliande room can be booked, giving you the chance to enjoy the personalised menus offered by the Restaurant du Lac de Trémelin. For those who prefer a quicker option, the snack bar and bar at Lac de Trémelin also offer a variety of choices, including burgers, crêpes, chips, sandwiches and ice creams. If you have any questions, please contact the managers on 02 99 09 73 79 / contact@tremelin.com
Campsite and gîtes:
- 55 semi-shaded pitches near Lac de Trémelin. Open from April to October.
- The gîtes are open all year round. There are 14 gîtes for 5 people and 4 gîtes for 7 people. Open all year round.
Do you have any questions? Contact the managers on 02 99 09 73 79 / contact@tremelin.com / www.tremelin.com
Natural camper van site:
The natural area is located in the extension of car park P2 and is reserved exclusively for motor caravans. This is a natural area, with no access to the campsite’s sanitary facilities or electricity.
- The number of spaces is limited to 5 motorhomes.
- The maximum authorised parking time is 48 hours.
- Barbecues are prohibited, as on the rest of the site.

Good practice for a great time by the lake

I park in the places indicated without obstructing traffic or emergency access.
I’m responsible and I collect my rubbish! There are recycling bins in the car parks. And I’ll do even better – I’ll take it home if I can.
I don’t use barbecues or campfires to reduce the risk of fire.
I don’t use my private boat to navigate on the lake.
I keep my dog on a lead.
I only swim in the authorised area and when the lifeguard station is open (in July and August from 1.30pm to 7pm).