Hiking: the 25 moguls circuit, the GR 20 in the Fontainebleau forest in the Paris region

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Published by Margot de Sortiraparis · Photos by Margot de Sortiraparis · Published on December 19, 2024 at 01:48 p.m.
In Corsica, they have the GR 20, reputed to be the most difficult of the French Grande Randonnée (GR) trails. In the Île-de-France region, we're a long way from rivalling the circuit's 200 kilometers and 11,000 meters of ascent, yet it's here, in the forest of Fontainebleau, that you'll find one of the region's most demanding hikes.

If you're a trail runner, a hiker or even a nature trekker looking for a circuit with positive gradients, the 25 Moguls should be just what you're looking for. Located in the forest of Fontainebleau, in the heart of the Trois Pignons massif, at Noisy-sur-École (77), the course is the talk of Paris and the Île-de-France region.

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When embarking on this ascent, we advise you to bein good physical condition, with well-muscled calves and a well-trained cardio system, as the 25 moguls circuit is no easy ride. As its name suggests, it comprises a total of twenty-five bumps, all located within the 3 Pignons massif. As you walk along its paths, you'll discover some of the treasures hidden in the heart of the Forêt de Fontainebleau, including the Cul-de-Chien sands, the Tortue rocks, the Souris rocks, the Éléphant perché rocks, the Bilboquet rocks...

In the past, this route was used by mountaineers to train before setting off into the high mountains. Nowadays, it's used by many amateur sportsmen and women, with a loop of around 16 km and over 800 metres of ascent. Allow between 5 and 7 hours, depending on your walking speed, to complete these legendary 25 moguls. Departure is from the Croix-Saint-Jérôme parking lot, after passing Arbonne-la-Forêt and heading towards Milly-la-Forêt.

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If you want to get started, we advise you to save yourself (and your itinerary) by following the circuit in .gpx format (available here), or get hold of the IGN map of the Forêt de Fontainebleau.

Practical information

Dates and Opening Time
From November 18, 2023 to December 31, 2027

× Approximate opening times: to confirm opening times, please contact the establishment.

    Location

    massif des trois pignons
    77123 Noisy sur Ecole

    Route planner

    Prices
    Free

    Official website
    les-25bosses.com

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