Best lakes around Saint-Mars-De-Coutais offer diverse natural experiences in the Loire-Atlantique department of western France. The region is characterized by its wetlands and the significant Lac de Grand-Lieu, one of France's largest natural lakes. This area provides opportunities for observing avian fauna and enjoying tranquil waterscapes. Saint-Mars-De-Coutais serves as a gateway to these natural environments, with several accessible points for exploration.
Last updated: May 24, 2026
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I went there to take a dip but the site was littered with rubbish (cake wrappers, chips, candy, tissues, McDonald's bags, pizza boxes, etc.) right down to the water. Exceptional because it was the day after the music festival or just a habit? Sunday was also packed with people (obviously)
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The largest natural plain lake and the second largest ornithological reserve in France, Lake Grand-Lieu offers magnificent lakeside landscapes. Here, you have to get off your bike to get as close as possible to its waters.
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Magnificent view of the lake 👌
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It's quiet and it rolls well Perfect for a quiet ride
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Arriving from La Chevroliere in the direction of Pont Saint Martin, turn off to cross the Ognon with the Bac in spring and summer, it's more pleasant
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It is possible to go around the lake by bike
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Beautiful view of the lake of Grand-Lieu
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At the end of winter, the path stops with the level of the lake which cuts the road and does not allow you to go to the end. But it doesn't matter, it's always nice to go for a little walk
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For pleasant walks, consider the Lake path between Bouaye and Saint Aignan de Grand Lieu, which is shaded and accessible to all. It runs along the marshes of Lake Grand-Lieu. Another great option is the area around Lake Grand-Lieu, Pierre Aiguë site, offering panoramic views and a bird observatory.
Yes, several lakes are well-suited for families. Etang de Roche Ballue is a popular choice, offering swimming (with supervised swimming in summer, for a fee) and amenities like children's games and picnic tables. The Lake Grand-Lieu, Pierre Aiguë site and Lake Grand-Lieu itself are also noted as family-friendly, providing beautiful views and observation opportunities.
The best time to visit is generally outside of winter. During winter, the water levels of Lac de Grand-Lieu can rise significantly, sometimes doubling its size or cutting off paths, as noted for the Pierre Aiguë site and Lake Grand-Lieu. Spring, summer, and autumn offer more accessible conditions for exploration and activities.
Yes, the Lake path between Bouaye and Saint Aignan de Grand Lieu is explicitly described as wheelchair accessible and open to all. The Lake Grand-Lieu, Pierre Aiguë site is also generally accessible to everyone, except during winter when high water levels might affect access.
Yes, you can go swimming at Etang de Roche Ballue. This former quarry is open for swimming, with supervised swimming available during the summer months (note that entry is payable in summer). Be aware that beyond the buoys, the pond becomes very deep.
The region, particularly around Lac de Grand-Lieu, is known for its rich avian fauna due to its significant wetlands. The Lake Grand-Lieu, Pierre Aiguë site features a bird observatory, making it an excellent spot for birdwatching. The Chemin de l'Estacade near Etang de Roche Ballue also offers observation posts for wetlands and their avian inhabitants.
Yes, the area offers various cycling opportunities. You can find several routes, including easy to difficult options, in the Cycling around Saint-Mars-De-Coutais guide. For example, the 'Le Tenu – Le Port Hamoneau loop' is a moderate 42 km ride. Lake Grand-Lieu also offers rare road bike access to its edge in certain spots.
There are several hiking trails to explore. A notable one is the 'Tour of Lake Grand-Lieu Trail', a moderate 18.5 km route. You can find more options, including easy and moderate trails like the 'Marshes loop from La Berderie', in the Hiking around Saint-Mars-De-Coutais guide.
While not explicitly 'hidden', the Etang de Roche Ballue offers a unique experience as an old quarry transformed into a swimming spot with surrounding paths like the Chemin de la Mandrine, which leads to the Port Lavigne shipyard and intriguing animal statues perched in trees. It provides a different kind of natural exploration compared to the larger Lac de Grand-Lieu.
Visitors particularly appreciate the tranquil waterscapes, the opportunities for bird observation, and the accessible paths. The shaded walking paths, like the one between Bouaye and Saint Aignan de Grand Lieu, are often described as very nice and relaxing. The panoramic views of Lac de Grand-Lieu, especially from the Pierre Aiguë site, are also highly valued.
Yes, the region offers gravel biking opportunities. You can find challenging routes such as the 'Vallon de la Chaussée – Lac de Grand-Lieu loop from Sainte-Pazanne' (76 km) or the 'Robert's Causeway – Loire River Ferry Crossing loop from Bouaye' (40 km). Explore more options in the Gravel biking around Saint-Mars-De-Coutais guide.


Still not found your perfect lake around Saint-Mars-De-Coutais? Check out the guides of these regions to see even more beautiful places.