Église Notre-Dame (Sermaise) walks

A hike from station to station in the upper Orge valley, following the river. Discover the rich heritage of Dourdan town centre (fortified castle, 12th-13th century church, wash houses, etc.) as well as beautiful churches along the way.

A circular starting from a railway station, during which you climb and descend through woods and walk along the cultivated plateaus on both sides of the Orge valley, from where you can enjoy extensive views.

Starting from Le Marais, crossing La Rémarde, the Bois du Marais and L’Orge at Saint-Evroult, to Le Mesnil on the southern hillside, and returning via Sermaise to rejoin the Bois du Marais. A succession of woods, villages and the edges of farmland.

From Sermaise to Roinville via the GR®1 on the southern slope of the Orge, through woods and fields and a few hamlets, then back to Sermaise via the northern slope, to the edge of the Bois du Marais.

This stage of the GR®1 is one of the most difficult on this GR®. It is 32 km long and has an elevation gain of over 400 m. It is also one of the most beautiful. Starting from Lardy, this hike takes you past magnificent monuments such as the Church of Saint-Sulpice, the Church of Saint-Yon, the Church of Sermaise and the Château de Dourdan. There are other monuments to visit in this town. Most of the route is in the countryside, with several ascents and descents into the valleys. The route passes through numerous villages of varying sizes.

Over 500 km long and with more than 4,000 m of elevation gain, this hike is accessible to everyone if broken down into several stages. Beautiful, rural and fairly close to Paris, it is suitable for anyone who wants to try their hand at hiking. There are many points of interest along this route. History and heritage enthusiasts, as well as nature lovers, will find something to enjoy.

The Orge river flows through the Essonne department, first from west to east and then diagonally from south-west to north-east. This route follows the valley as closely as possible, where it is accessible by train. The route alternates between paths along the river, including a promenade in the downstream section, passages through the undergrowth, residential areas and urban routes.