© La vallée de la Vilaine en automne | Yannick Le Gal

A natural treasure hunt

Let go and switch to explorer mode!
Discover some of the most beautiful natural sites in Ille-et-Vilaine thanks to geocaching with the Trésors de Haute Bretagne app.

Megaliths and moors, a walk among dolmens and standing stones

At the heart of Pays de Redon, Cojoux and Tréal moors in Saint-Just form an exceptional natural area. It is also one of the most important pre-historic sites in Brittany. Situated on a rocky ridge, it contains a unique range of dolmens and standing stones scattered over 6 km among a landscape of moors and heathers.  The colours change with the season, creating a treat for the eyes!

Plan for 2 to 2 1/2 hours of walking and good shoes.

Trésors de Haute Bretagne, Megaliths and moors

A walk in nature in Couesnon valley

The Couesnon is a little river that crosses the north-east of Ille-et-Vilaine before flowing into the Bay of Mont Saint-Michel. There it forms a valley in the middle of bocages, meadows and peaceful little villages. Between Saint-Ouen-des-Alleux and Mézières-sur-Couesnon, it crosses a natural area developed for hiking. Put your hiking shoes on. There is treasure to be found here. Follow the river’s course to find it…

Trésors de Haute Bretagne, Couesnon valley

The moors of Vallon de la Chambre au Loup

Close your eyes. Breathe in the scent of coconut given off by the blossoming gorse. Let the breeze drift over you. It’s spring, and you’re in Brocéliande, in the Vallon de la Chambre au Loup. Here, nature offers an exceptional landscape in the midst of unspoilt and colourful nature. Mystery and legend reign here all year round, whatever the season. Can you find the hidden treasure?

Trésors de Haute Bretagne, In The moors of Vallon de la Chambre au Loup

View overlooking the banks of the Rance

In Saint-Suliac on the banks of the Rance, Mont-Garrot culminates at 73 metres and offers a wonderful view of the River Rance. At the top, Moulin de la Chaise, inactive since 1897, is the starting point for your walk. On the programme, the discovery of the vineyards – Mont Garrot has its own vintage –, the remains of an enigmatic Viking camp and above all, an exceptional view of the River Rance and Saint-Suliac bay. Don’t forget the other treasure, the one in the geocache on Mont Garrot.

Trésors de Haute Bretagne, Saint-Suliac Mont-Garrot

The canal in Hédé Bazouges

One canal and many locks, all in a bucolic atmosphere. Welcome to the Ille-et-Rance canal on the site of 11 locks. Here, men have built a ladder for boats: 11 locks over a distance of 2 kilometres to get through a 27-metre drop. This technical prowess can be observed as you stroll along the towpath between floral bridges and lock-keepers’ houses in search of the treasures of Upper Brittany.

Trésors de Haute Bretagne, l’eau rigole au canal


Geocaching is a fun family activity, but like every game, there are rules.

  • Respect the environment and keep the area of the cache intact
  • Be discreet when you find the treasure
  • Sign the logbook and put it back in the cache
  • Put the cache back where you found it
  • Share the experience with the community and register your find on-line via the mobile app
  • Do not put any illegal, dangerous or edible items in the caches.

More nature and relaxation

Nos suggestions