Opton (rivière) walks

This is the penultimate stage of the GR®1. It takes you out of the Rambouillet Forest and to the Villiers-Saint-Frédéric RER station. Halfway along the route is the pretty medieval town of Montfort-l'Amaury. The ruins offer superb views of the surrounding area. Half of the stage is through forest, i.e. up to Montfort-l'Amaury. The other part of the stage is more rural.

Fifth stage of the Grand Tour of Île-de-France on the GR®11, connecting Orgerus-Béhoust station to Mantes-Station, still through the Yvelines. This is a northbound route that joins the Seine valley at Mantes-la-Jolie, descending the valleys of the Flexanville and then the Vaucouleurs rivers. The route follows both paths at the bottom of the valley and paths on the adjacent plateaus.

The Rambouillet Forest is one of the largest forests in the Paris region. This section ofthe GR®®1 trailallows you to explore the western part of the forest. It is full of charm and features remarkable sites such as the Chêne de la Pocqueterie oak tree, the Rochers d'Angennes rocks and the Pierre Ardoue stone. The route starts in a town with great cultural potential, including the Château de Rambouillet, the Hermitage, the Laiterie de la Reine and the Chaumière aux Coquillages.

A south-north crossing of the Rambouillet and Quatre Piliers forests, from station to station! The route, mainly through forest, is long and requires a good sense of direction for the first half. Several ponds and remarkable trees line the route.

A hike from station to station that will take you through the forest of the Haute Vallée de Chevreuse Regional Nature Park. Ponds, castle, forest, ramparts and museum: everything you need for a wonderful day out with family or friends.

Hike in the Rambouillet forest, but in the lesser-known and less frequented part. The Rochers d'Angennes are impressive; you don't expect to find yourself in a blue-collar atmosphere in this place. Hike from station to station with a fast TER at the end, if returning to Paris.

A hike from station to station with a water theme! In the Haute Vallée de Chevreuse Natural Park and then in the Rambouillet Forest, this is a pleasant route, mostly shaded, along ponds, small canals and a charming river, the Drouette.

A hike from station to station that takes us to the source of the River Yvette and then up and down through the woods that frame its valley. The route crosses the Maincourt Marsh and then an area of rocky chaos. The forest trails are interspersed with villages and hamlets rich in heritage.