Natural monuments around Sainte-Marie offer a diverse range of historical and natural sites. This region features ancient megalithic structures and unique natural formations. Visitors can explore sites that combine human history with geological features. The area provides opportunities to discover significant cultural and natural landmarks.
Last updated: August 14, 2026
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Sacred space, Saint-Just was frequented by Neolithic people for several millennia. Our distant ancestors settled on these dry moors to form a major complex of megalithic monuments, the second most important in Brittany, after Carnac. On a route of about 6km you can discover various alignments bearing strange names often linked to a local legend. The path can be walked, run or even cycled across a moor that offers no shade or shelter. A magical and fascinating place in every respect
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Very nice hike. Please note, the indicated parking lot no longer exists, you must park near the football stadium
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The Gannedel marsh was formed where the Canut joins the Vilaine, and is today classified as a natural zone of ecological fauna and flora interest (ZNIEFF), welcoming more than a hundred species of birds throughout the year.
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The covered alley of Tréal or also called Grotte aux fées according to a legend is an isolated burial site, located at the top of a hill called "La butte de Tréal" or "the rock of Tréal".
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About 5000 years old row of stones with good explanation.
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Quarry difficult to access by certain passages, but remains accessible by bypassing the site to the observatory where there is a very beautiful panorama in clear weather.
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The pottery found dates this tomb to around 2500 and 3500 BC. This tomb with a side entrance, more than 15 meters long, was very degraded. It is 15 meters long and is a real spectacle.
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At La Chapelle-de-Brain in the Pays de Redon, the natural area of the Gannedel marshes promises a pleasant walk between reedbeds, wet meadows and bodies of water. A circuit fitted out with footbridges and observatories facilitates the exploration of the site of great ecological value.
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The region around Sainte-Marie offers a fascinating blend of natural and ancient historical sites. You can explore the impressive Alignments du Moulin, featuring 5000-year-old megaliths. Another significant site is the Megaliths of Saint-Just, considered the second most important megalithic complex in Brittany. For a different natural experience, the Marais de Gannedel offers a tranquil marshland walk with rich biodiversity.
Yes, several natural monuments around Sainte-Marie are great for families. Both the Alignments du Moulin and the Megaliths of Saint-Just are marked as family-friendly, offering historical exploration in an open setting. The Marais de Gannedel also provides an accessible and engaging walk through marshlands, perfect for all ages.
The region is rich in ancient historical sites that are also considered natural monuments. The Alignments du Moulin features megaliths dating back around 5000 years, offering a glimpse into Neolithic culture. Similarly, the Megaliths of Saint-Just is a major complex of ancient stone alignments. For a more mysterious historical site, visit The Fairy Cave of Tréal, an isolated burial site with a fascinating legend.
Absolutely. The Fairy Cave of Tréal offers superb views of the surrounding countryside from its hilltop location. The Bellion Quarry also provides exceptional views from its slopes, dominating the surrounding valleys by about thirty meters.
The area around Sainte-Marie is excellent for various outdoor activities. You can enjoy road cycling on routes like the 'Pont du Grand Pas – Château du Port d'Or' loop, or explore mountain biking trails such as the 'Chapelle St Laurent – Saint-Marcellin Chapel' loop. Gravel biking is also popular, with routes like the 'Green Slate Gravel Path – Melneuf lock' loop. For more details on routes, check out the Road Cycling Routes around Sainte-Marie, MTB Trails around Sainte-Marie, and Gravel biking around Sainte-Marie guides.
Yes, many natural monuments are integrated into or near hiking opportunities. The Megaliths of Saint-Just can be explored via a route of about 6km across the moor. The Marais de Gannedel offers a pleasant 6km walk around the marsh, with footbridges and observatories. For more extensive hiking, consider the various MTB and gravel biking routes which often include scenic trails suitable for walking.
The Marais de Gannedel is a particularly rich area for wildlife, classified as a natural zone of ecological fauna and flora interest (ZNIEFF). It welcomes over a hundred species of birds throughout the year, making it an excellent spot for birdwatching. Other natural areas may also host local flora and fauna, especially along trails and in less disturbed environments.
The time required varies by site. For the Megaliths of Saint-Just, a full exploration of the 6km route could take a couple of hours. A walk around the Marais de Gannedel is also about 6km and can be enjoyed at a leisurely pace. Shorter visits to sites like the Alignments du Moulin or The Fairy Cave of Tréal might take less than an hour, depending on how much you wish to explore and read the explanations.
Parking information is available for some sites. For the Alignments du Moulin, visitors should note that the indicated parking lot no longer exists, and it's recommended to park near the football stadium. For other sites, parking is generally available nearby, but it's always good to check local signage upon arrival.
While popular, the The Fairy Cave of Tréal is an isolated burial site that offers a unique experience with impressive megaliths and a superb view, often less crowded than more famous sites. The Bellion Quarry is also an atypical place, managed by a local association that organizes outdoor shows, making it a picturesque and culturally rich 'green setting' worth discovering.


Extend your search for the best caves by checking out these guides of the top ones around Sainte-Marie: