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Pays de la Loire
Châteaubriant-Ancenis

Treffieux

Attractions and Places To See around Treffieux - Top 12

Best attractions and places to see around Treffieux, a commune in Loire-Atlantique, France, include a mix of natural sites and historical points of interest. The area is characterized by significant bodies of water like Lac de Vioreau and Mine Lake, alongside unique geological features such as the Terril d'Abbaretz. These locations offer opportunities for outdoor activities and insight into the region's past. Treffieux provides a setting for exploring local heritage and natural landscapes.

Best attractions and places to see around…

Last updated: July 2, 2026

The Slag Heap

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A former source of tin, this site has long been used as a mine. The slag heap, which is said to be 70 to 121 meters high, is a magnificent …

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A quiet deck with stunning views of the lake. A great place to take a break from your run and take in the scenery.

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Lake Vioreau

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Largest reservoir in the Loire-Atlantique department with an area of 200 hectares. It enables the Nantes-Brest Canal to be supplied with water via the supply canal. It is owned by the Loire-Atlantique Department under the direction of the Maritime Service.

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Mine Lake

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This deep mine excavation is now a beautiful lake and hiking spot. The calm waters offer amazing reflections from the shore.

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Abbaretz lagoon

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A half-Mordor, half-Mad Max atmosphere with these reddish-orange marshes. The color is due to the oxidation of heavy metals contained in these highly acidic waters: iron, manganese, cobalt, and... arsenic. …

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Christophe
November 18, 2025, Le Terril

While the ascent of the slag heap is flat and gently uphill in its first part, it is followed by a long, steeper section of walking before reaching the summit. It is clearly stated that descending via any route other than the designated access point is strongly discouraged due to the risk of rockfalls.

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The west bridge of Lake Voireau offers a beautiful, unobstructed view of the reservoir. The largest body of water in Loire-Atlantique, this lake stretches through the heart of the forest. Its wooded banks and landscaped beaches make it a pleasant stopover for a nature break or a swim.

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Fred
May 10, 2025, Lagune d'Abbaretz

A half-Mordor, half-Mad Max atmosphere with these reddish-orange marshes. The color is due to the oxidation of heavy metals contained in these highly acidic waters: iron, manganese, cobalt, and... arsenic. It's actually due to severe arsenic pollution that access to the second spoil heap has been prohibited since 2019. You can tour the site by bike, but it's clearly mountain biking/gravel riding (walkways, roots, rocks, etc.).

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A quiet deck with stunning views of the lake. A great place to take a break from your run and take in the scenery.

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This deep mine excavation is now a beautiful lake and hiking spot. The calm waters offer amazing reflections from the shore.

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Paul_C
June 16, 2023, Le Terril

A former source of tin, this site has long been used as a mine. The slag heap, which is said to be 70 to 121 meters high, is a magnificent vantage point. An orientation table is also at the top to enhance your experience.

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Matto
October 31, 2021, Lac de Vioreau

Largest reservoir in the Loire-Atlantique department with an area of 200 hectares. It enables the Nantes-Brest Canal to be supplied with water via the supply canal. It is owned by the Loire-Atlantique Department under the direction of the Maritime Service.

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Clear passage with view on the lake, little traffic, landscape changing according to the season and the filling of the reservoir.

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Frequently Asked Questions

What natural features can I explore around Treffieux?

The area around Treffieux is rich in natural beauty, particularly its lakes and unique geological formations. You can visit West bridge at Lac de Vioreau, which offers stunning, unobstructed views of the largest body of water in Loire-Atlantique. Another significant spot is Mine Lake, a deep mine excavation now transformed into a beautiful hiking spot with calm waters reflecting the surroundings. Additionally, the The Slag Heap near Abbaretz, a former tin mine spoil tip, provides a magnificent vantage point with an orientation table at the top.

Are there historical sites or landmarks to visit in Treffieux?

Treffieux offers glimpses into its past with several historical points of interest. You can find an ancient standing stone, a Menhir, which speaks to the region's prehistoric heritage. The Vieux Moulin de la Fleuriais, an old mill, is another local historical landmark. For those interested in the area's farming history, there's also a Collection Agricole within the commune.

What outdoor activities are popular near Treffieux's attractions?

The natural attractions around Treffieux are perfect for various outdoor activities. Hiking is very popular, with routes like the Mine Trail and loops around Mine Lake. You can find more details on hiking routes at Hiking around Treffieux. For cyclists, there are road cycling routes, including loops around Mine Lake and the Abbaretz mine spoil tip, which you can explore at Road Cycling Routes around Treffieux. Running trails are also available, such as loops around The Slag Heap and Mine Lake; discover them at Running Trails around Treffieux.

Are there any family-friendly activities or attractions?

While specific family-friendly attractions are not detailed, the natural settings around Treffieux offer opportunities for family outings. The wooded banks and landscaped beaches of Lake Vioreau make it a pleasant stopover for a nature break or a swim, which can be enjoyable for families. The Train Touristique de Gruellau Treffieux also suggests a scenic rail experience that could appeal to all ages.

What do visitors enjoy most about the attractions around Treffieux?

Visitors particularly appreciate the serene natural beauty and the opportunities for peaceful outdoor breaks. The quiet deck at West bridge at Lac de Vioreau is noted for its stunning views and as a great place to take a break. The calm waters of Mine Lake offer amazing reflections, making it a favorite hiking spot. The unique landscape and vantage point from The Slag Heap are also highly valued for their distinct views.

Are there any easy walking trails near Treffieux?

Yes, there are several easy walking trails in the vicinity. The Mine Trail is an easy 7.2 km hike. Other easy loops include the Mine Lake loop (3.5 km) and the Abbaretz mine spoil tip loop (2.9 km). The Étang de Gruellau also offers an easy 3 km loop. You can find more details on these and other hiking routes at Hiking around Treffieux.

What is the best time to visit Treffieux for outdoor activities?

The region's natural landscapes, including lakes and trails, are enjoyable across seasons. However, for comfortable hiking, cycling, and general outdoor exploration, spring and autumn typically offer pleasant temperatures and beautiful scenery. Summer is also suitable, especially for activities involving the lakes like Lac de Vioreau, though it can be warmer. Winter offers a different, often quieter, experience for walks.

Where can I find viewpoints or scenic spots?

For panoramic views, the summit of The Slag Heap is an excellent choice. It's described as a magnificent vantage point with an orientation table to enhance your experience. Additionally, the West bridge at Lac de Vioreau provides stunning, unobstructed views of the reservoir and its wooded banks, offering a picturesque setting.

Are there any unique natural sites besides the lakes?

Beyond the prominent lakes, the The Slag Heap (Terril d'Abbaretz) stands out as a unique natural feature. This spoil tip, resulting from past mining activities, offers a distinct landscape and provides excellent walking opportunities with elevated views of the surrounding area.

What are the options for cycling around Treffieux?

Cycling is a great way to explore the area. You can find various road cycling routes, including an easy 29.3 km loop around the Abbaretz mine spoil tip from Nozay, or a moderate 40.2 km loop connecting Mine Lake and the Abbaretz mine spoil tip. For more options and detailed routes, refer to Road Cycling Routes around Treffieux.

Are there any hidden gems or less-known spots worth visiting?

While many locals are familiar with Lake Vioreau, the Arcades Trail near Vioreau is considered a less-known but magnificent path. It borders the 'food channel' of the Nantes-Brest canal and is a must-explore on foot or by bike for those seeking a quieter, more unique experience away from the main crowds.

What is the largest body of water in the area?

The largest body of water in the Loire-Atlantique department, and a significant feature near Treffieux, is Lake Vioreau. This reservoir spans 200 hectares and plays a crucial role in supplying water to the Nantes-Brest Canal. Its wooded banks and landscaped beaches make it a popular spot for nature lovers.

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