A must-see visit to discover the flora and fauna of the Brière and the work being done by the Regional Nature Park. At the ornithological observatory, you can watch Spoonbills, Bluebirds, Egrets...
Open from 6 April to 2 November 2025.
Open 7 days a week from 9am to 6pm.
Guided tours from May 2025.
Car park at the Rozé lock, then pedestrian access: cross the two Rozé lock bridges, then take the path that runs along the Rozé canal for 800 m on your right.
> From the port of Rozé, the Nature Park offers two digital applications, one leading to the Maison de la Réserve, the other following the GR® de Pays Tour de Brière as far as Loncé in Montoir-de-Bretagne:
- Immersion en Brière: A digital trail leading from Rozé to the Regional Nature Reserve.
- Ecobalade: Digital application to discover the flora and fauna of the Brière along the GR® de Pays Tour de Brière, from the port of Rozé in Saint-Malo-de-Guersac to Loncé in Montoir-de-Bretagne.
Observatory of the Marais de Brière Regional Nature Reserve - Pierre Constant site
Open from 6 April to 2 November 2025 - 7 days a week from 9am to 6pm - Free access to the ornithological observatory
Sunday to Thursday inclusive: access to the exhibition on the Brière Nature Reserve from 10am to 6pm.
Guided tours of the Regional Nature Reserve will begin in May:
In May: Wednesdays 7 and 21 from 9.30am to 11.30am
In June: Wednesdays 4 and 18 from 9.30am to 11.30am
July: Wednesday 2 July from 9.30am to 11.30am, Tuesdays 8 - 15 - 22 - 29 and Thursdays 10 - 17 - 24 - 31 from 9.30am to 11.30am.
August: Tuesdays 5 - 12 - 19 - 26 and Thursdays 7 - 14 - 21 - 28 from 9.30am to 11.30am
Registration required: Maison du Parc 02 40 91 68 68 or https://www.parc-naturel-briere.com/agenda/
Open 7 days a week from 9am to 6pm.
Guided tours from May 2025.
Car park at the Rozé lock, then pedestrian access: cross the two Rozé lock bridges, then take the path that runs along the Rozé canal for 800 m on your right.
> From the port of Rozé, the Nature Park offers two digital applications, one leading to the Maison de la Réserve, the other following the GR® de Pays Tour de Brière as far as Loncé in Montoir-de-Bretagne:
- Immersion en Brière: A digital trail leading from Rozé to the Regional Nature Reserve.
- Ecobalade: Digital application to discover the flora and fauna of the Brière along the GR® de Pays Tour de Brière, from the port of Rozé in Saint-Malo-de-Guersac to Loncé in Montoir-de-Bretagne.
Observatory of the Marais de Brière Regional Nature Reserve - Pierre Constant site
Open from 6 April to 2 November 2025 - 7 days a week from 9am to 6pm - Free access to the ornithological observatory
Sunday to Thursday inclusive: access to the exhibition on the Brière Nature Reserve from 10am to 6pm.
Guided tours of the Regional Nature Reserve will begin in May:
In May: Wednesdays 7 and 21 from 9.30am to 11.30am
In June: Wednesdays 4 and 18 from 9.30am to 11.30am
July: Wednesday 2 July from 9.30am to 11.30am, Tuesdays 8 - 15 - 22 - 29 and Thursdays 10 - 17 - 24 - 31 from 9.30am to 11.30am.
August: Tuesdays 5 - 12 - 19 - 26 and Thursdays 7 - 14 - 21 - 28 from 9.30am to 11.30am
Registration required: Maison du Parc 02 40 91 68 68 or https://www.parc-naturel-briere.com/agenda/
Services
Services
Picnic area
Guided tours for individuals
Payment methods
Payment methods
Payment methods
Debit cards
Cheques and giro cheques
Holiday chequesOpenings
Openings
From 6 April 2025 until 2 November 2025 -
Location
Location
Access
Access
- Public transport : Ligne T3 - Arrêt : Port de Rozé at 1km
