Trail de la Brière

The Trail de la Brière is a 30-kilometre trail race with 200 metres of elevation gain, starting from Saint-Nazaire, a major port city in Loire-Atlantique, at the gateway to the Brière Regional Natural Park. This atypical event offers an immersion into one of the most singular landscapes in France: the Brière marshes, the country's second largest wetland after the Camargue — an aquatic and terrestrial world where reeds sway in the westerly wind and silent canals trace a labyrinth of silvery reflections.

Saint-Nazaire, a city of shipbuilding and gateway to the Loire estuary, is the starting point towards a universe radically different from its industrial and maritime landscape. Within a few kilometres, runners leave the Atlantic quays to enter the Grande Brière Mottière marsh, a vast expanse of 7,000 hectares of swamp, flood meadows, and low islands that for centuries was the collective property of the Briérons — a status unique in France, granted by Duke François II of Brittany in 1461 and confirmed by every successive regime.

The Trail de la Brière course follows paths and towpaths that run alongside canals and cross the marsh meadows. With just 200 metres of elevation gain over 30 kilometres, the profile is virtually flat, but this apparent ease is deceptive. Marsh trails, often damp and spongy, impose constant muscular effort to maintain balance and stride. Passages along the earthen levees bordering the canals, sometimes narrow and slippery, demand permanent concentration. The wind, ever-present in this open, flat expanse, can prove a formidable adversary, turning exposed sections into genuine tests of endurance.

The Brière is an ecosystem of exceptional natural richness, classified as a Ramsar site of international importance for wetlands. Runners traverse a living landscape populated by spectacular birdlife: grey and purple herons, little egrets, marsh harriers, bluethroats, and in spring, whiskered terns nesting in the reedbeds. The canals shelter pike, eels, and crayfish, while the wet meadows host carpets of water crowfoot and striking yellow flag iris. The light in Brière is unique, ever-changing, shifting in moments from pearly grey to intense gold that sets the reeds ablaze and transforms the water surfaces into copper mirrors.

The Trail de la Brière is an event that invites runners to reconsider what trail running can be. Far from summits and vertiginous elevation gains, this race proves that adventure can arise from flat terrain when that terrain is inhabited by powerful nature and a singular culture. Brière, with its thatched cottages, flat-bottomed punts gliding along the canals, and traditions of fishing and reed-cutting passed down through generations, is a world apart — a fragment of ancestral rural France miraculously preserved on the doorstep of a metropolis. To run the Trail de la Brière is to tread a land of water and memory, where every step resonates between sky and marsh.

Trail de la Brière is a 30 km trail race with 200 m of elevation gain, located in Saint-Nazaire, Loire-Atlantique. The next edition is scheduled for 19 April 2026.

Find all official information on the race website.