Best castles around Héric offer a glimpse into the region's history and natural landscapes. The area features historical sites set within green spaces, including parks and forests, often alongside rivers like the Erdre and Isac. These locations combine cultural significance with opportunities for outdoor exploration. The castles reflect various architectural periods, from medieval fortresses to 19th-century estates.
Last updated: June 22, 2026
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The construction of Port Mulon Castle dates back to the 19th century. Of its various owners, it primarily preserves the memory of Prosper Coinquet. Born in 1825 in Nantes, Prosper Coinquet was mayor of Nort-sur-Erdre twice, from 1859 to 1874, and again from 1877 to 1892. He was also a general councilor for the Loire-Inférieure department from 1883 to 1887. This lawyer by training was also a great lover of the arts. He was himself a musician and poet. He composed numerous songs and waltzes that enjoyed considerable regional success. He dedicated one of his waltzes, simply titled "Le port Mulon," to his castle. Prosper Coinquet chaired or was a member of several musical and literary societies. It was therefore only natural that he decided to make the château the setting for evenings dedicated to the arts. Readings and concerts were held in the park or in the reception hall. Nantes artists invited to perform came by way of the Erdre River. The setting, its tranquil riverbank, and its magnificent park wooded with rare species, thus retain the imprint of the music that was performed there until 1892. That year, Prosper Coinquet died at home. Since 2006, music has once again resonated in the park's foliage. Indeed, at the end of June, the venue hosts the La Nuit de L'Erdre festival. Today, the Château de Port Mulon and its park are managed by the municipality of Nort-sur-Erdre. A reception hall can be rented from the town hall, whether for private or professional events. You can also take yoga classes at the château. As for the Nantes Atlantique improvisation league, it has made it its headquarters. Finally, since 2017, the place has become a coworking space whose success continues unabated. As for the park, it's a place where, in addition to enjoying its vast spaces and magnificent trees, you can indulge in an orienteering course. Twenty markers are scattered throughout, and by exploring them, you'll learn much more about the treasures it contains. During your stroll, you'll undoubtedly encounter riders who enjoy riding their horses there. And if, at nightfall, you spot the fluttering shadows of numerous bats, don't be surprised. For several years, the castle and grounds have been havens for these nocturnal animals.
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The current château is the work of Jean-Baptiste Ceineray, a renowned Nantes architect, who built it for Martin Boux de Casson, a councilor in the Parliament of Brittany. Construction began in 1753 with the central section and the left pavilion. The château was completed after the Revolution with the construction of the right pavilion in 1805. The park is home to a charming monument erected in the 19th century. It features a pond, overlooked by a grotto and a pink sandstone obelisk (a tribute from Jacques-Olivier Urvoy de Saint-Bedan to his wife, Marie-Pélagie). The building was listed as a historic monument in 1989. Its protected elements include the château's facades and roofs; the stairwell with its wrought iron railing; the Empire salon with its ornate decorations; the steps with its grand staircase; and the ornate garden with two stone lions at the entrance to the verdant hemicycle. In July 2021, a 250m² outbuilding caught fire and was completely destroyed. (The property is private and closed to the public; unauthorized access is prohibited.)
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The Plessis estate is mentioned as a seigneury as early as 1260. In 1753, the medieval castle, having become too uncomfortable, was rebuilt and replaced with the one we see today, in the classical style. In 1760, the blessing of the castle chapel took place; it was destroyed during the Revolution. Among the most illustrious occupants of the estate, we can mention: François Dollier de Casson (1636-1701), a cavalry captain and later a priest, who was sent on a mission to Quebec. He drew up part of the plans for the city of Montreal (the city owes its characteristic checkerboard structure to him, long before Philadelphia). In Montreal, a street, several buildings, and a retirement home now bear the name Casson. Jacques-Olivier Urvoy de Saint-Bedan (1780-1858) was mayor of Casson, general councilor, member of parliament for Loire-Inférieure, and city councilor of Nantes. He was an important patron of the arts, notably responsible for the construction of the Sainte-Anne asylum (Hospices of the Little Sisters of the Poor), the church of Casson, the bell tower of the church of Sucé, the Sainte-Anne de Casson chapel, and more. His art collection is now largely on display at the Nantes Art Museum thanks to his generous donation. The estate became the property of the Boux de Casson family. It then passed by inheritance to the Urvoy de Saint-Bedan family and then, through marriage, to the de Bouillé family, who still reside there.
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Beautiful medieval castle. The main building is more recent. As a side note, the Isac River fed the castle's imposing moats, now dry, before being channeled to the current marina.
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19th century castle overlooking a large 15 hectare park, known for its rare species and for its music festival "La Nuit de l'Erdre". The path along the Erdre can be very muddy in winter. Beyond the place called Les Mares Noires you can continue on a single track that crosses a fairly densely wooded area and/or the more rolling Noe-Guy path.
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Beautiful 16th century castle surrounded by a magnificent park. Many paths cross the park and the forest, lending themselves perfectly to a two-wheeled adventure.
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Located at the exit of the town of Blain, just next to the Nantes-Brest canal, this old medieval fortress invites you to walk in the footsteps of its prestigious guests such as the King of France Henry II, Queen Catherine de Medici or Duchess Anne of Brittany.
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To the north of the town of Orvault, the Château de la Tour is a magnificent 15th century building, set in a veritable green setting. The castle belongs since 1982 to the municipality and its park and open to the public.
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Yes, several castles in the Héric area are suitable for families. Château de la Groulais offers an escape game and a ginguette, while Château de la Tour has a large park with many paths for exploration. Port Mulon Park and Castle also features a vast park with an orienteering course and hosts a music festival.
The region around Héric offers various outdoor activities, often near the castles. You can find numerous routes for gravel biking, mountain biking, and cycling. Many castles, like Château de la Tour and Port Mulon Park and Castle, are set within large parks and forests with paths perfect for walking or cycling.
Port Mulon Park and Castle is a 19th-century castle overlooking a 15-hectare park known for its rare species and tranquil riverbank setting along the Erdre. Château de la Tour is also situated in a magnificent green setting with a park and forest open to the public.
Yes, Château de la Groulais is a notable medieval castle and historical site. Built in the 12th century, it was once the largest fortress in the region and now houses a ginguette, a lodge, and an escape game.
The castles and their surrounding parks are generally enjoyable throughout the year. Spring and summer offer pleasant weather for exploring the extensive parks and outdoor activities. Autumn provides beautiful foliage, while some paths, like those near Port Mulon Park and Castle, can be muddy in winter.
Many of the castles themselves are significant historical sites, reflecting various architectural periods. For instance, Château de la Groulais is a medieval fortress, and Château de la Tour is a 15th-century building. The region's history is deeply intertwined with these estates.
Yes, some historical estates are private. For example, Château du Plessis de Casson, a classical-style château rebuilt in the 18th century, is a private property and not open to unauthorized public access.
The castles around Héric showcase a diverse range of architectural styles. You can find medieval fortresses like Château de la Groulais, 15th-century buildings such as Château de la Tour, and 19th-century estates like Port Mulon Park and Castle, each with its unique design and history.
Visitors appreciate the combination of historical significance and natural beauty. The castles are often set within green spaces, parks, and forests, providing opportunities for outdoor exploration. The komoot community has shared over 60 photos and given more than 100 upvotes, highlighting the appeal of these sites.
Many castles, particularly those with extensive parks, offer opportunities for walks. Château de la Tour has many paths through its park and forest. While specific 'circular walks' around individual castles aren't detailed, the nearby cycling and MTB guides for Héric feature numerous loop routes that may pass by or near these historical sites.
Comfortable walking shoes are recommended, especially if you plan to explore the extensive parks and trails surrounding many of the castles. Dress in layers suitable for the weather, as you'll likely be spending time outdoors. If visiting in winter, be prepared for potentially muddy paths, particularly along riverbanks.


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