GR 1C and Vaux de Cernay Loop

The Loop Étang de Cernay and GR1C trail offers varied terrain. While it features mostly paved surfaces, you'll also encounter sections of 'chemin' (path) and 'sentier de randonnée' (hiking trail). Expect some unpaved and uneven sections, including potential 'grosses bosses' (big bumps) on descents, and possibly even difficult stairs in some parts of the wider park.

No, this trail is considered difficult and is described as a 'hard run' requiring 'very good fitness'. It's not recommended for beginners due to its length, elevation gain, and varied terrain.

This jogging loop typically takes around 1 hour and 49 minutes to complete, covering a distance of approximately 15.1 kilometers.

The route winds through the picturesque Parc Naturel Régional de la Haute Vallée de Chevreuse. Key features include the beautiful Cernay Pond with its medieval dike, charming landscapes along the Ru des Vaux, and historical sites like the Cistercian abbey of Vaux de Cernay. You'll also pass through the Five Hundred Arpents Forest Road and enjoy a View from above.

The trail is located within the Parc Naturel Régional de la Haute Vallée de Chevreuse. While specific parking locations for this exact starting point are not detailed, you should look for designated parking areas near the Étang de Cernay or within the villages surrounding the pond, such as Cernay-la-Ville or Auffargis.

The Parc Naturel Régional de la Haute Vallée de Chevreuse is beautiful year-round. However, for jogging, spring and autumn offer pleasant temperatures and vibrant scenery. Summer can be warm, but shaded woodland tracks provide relief. Winter conditions might include mud or ice, so check local forecasts.

Generally, dogs are allowed in the Parc Naturel Régional de la Haute Vallée de Chevreuse, but they must be kept on a leash to protect wildlife and ensure the safety of other visitors. Always clean up after your pet.

No, there are typically no permits or entrance fees required for general access to the trails within the Parc Naturel Régional de la Haute Vallée de Chevreuse for activities like jogging. It's a public natural park.

Yes, this route is part of the GR1C, which is a Grande Randonnée trail, indicating it's a well-marked long-distance path. The route also passes through sections of the Liaison GR 1 - GR 11, La carrière des Maréchaux, Chemin de Trèves, Igny - Rambouillet, Chemin des Vaux au Grand Moulin, Route des Cinq Cents Arpents, Route des Franchises, Sentier des Maréchaux, Chemin de la Bourbonnerie, chemin des Deserts, and Chemin de Vaux à Cernay-la-Ville.

While the trail itself is primarily natural, the surrounding villages like Cernay-la-Ville and Auffargis, which are part of the Parc Naturel Régional de la Haute Vallée de Chevreuse, offer cafes, restaurants, and other facilities where you can refresh before or after your run.

Given the 'difficult' rating and varied terrain, it's recommended to bring appropriate jogging shoes with good grip, sufficient water, and snacks. A map or GPS device is also advisable, especially since some sections are unpaved. Dress in layers suitable for the weather conditions.