4.4
(126)
1,082
riders
177
rides
Touring cycling routes around Oncy-Sur-École traverse the diverse landscapes of the Gâtinais Français Regional Natural Park and the nearby Fontainebleau Forest. The region features a mosaic of forests, agricultural plains, and river valleys, including the École River. Sandstone formations and rolling hills characterize the terrain, offering varied cycling experiences. The area is predominantly natural, with significant woodland and agricultural land contributing to its rural character.
Last updated: July 4, 2026
5.0
(2)
84
riders
47.9km
04:16
410m
410m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
25
riders
46.3km
04:07
420m
420m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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4.3
(3)
13
riders
Easy bike ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
13
riders
Easy bike ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.
4.3
(3)
8
riders
39.1km
02:29
230m
230m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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It's not the dog's ass, but the cup and ball, the dog's ass is an enormous rock located a few dozen meters away.
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A temple of Dada art!
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Very sandy, we had to get off our bikes
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The mill is said to be over two thousand years old. Joan of Arc stayed there and Louis XI is said to have donated it to his advisor Olivier le Daim.
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quick access to the dog's ass
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Yes, indeed pretty Patelin :-)
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The trail moves on to the main essentials The hall In 1479, by a special grace from Louis The North-South facing Hall, 46 m long, 16 m wide and 13 m high, covers a total surface area of 730 m2. 48 oak pillars, resting on “dice”-cut stone bases, support a chestnut frame typical of Ile-de-France at that time; this frame presents to the north (on the rue Langlois side) a “pavilion” farm. Today, La Halle is still the site of a market on Thursday afternoons. The square, the houses gathered all around, bear witness to the great commercial activity which already reigned in the region 500 years ago. La Halle has been classified as a Historic Monument since 1923. Bonde Castle is located near the town center of Milly-la-Forêt, Built near an artificial island in the l'École river to the west of the Notre-Dame collegiate church, its park is bordered to the west by the course of the river which forms a moat to the north protecting the châtelet. History Built in the 12th century by the lords of Milly, the castle was ruined during the English siege in 1432. At the end of the 15th century around 1475, owned by Admiral Louis Malet de Graville, it was rebuilt and enlarged. What was then the keep became the entrance gatehouse, the drawbridge was replaced by a permanent stone bridge and a gate closed access between the northern defense tower and the governor's house. A square courtyard was surrounded by a wall and had in the center a chapel dedicated to Saint Valentine. The castle was successively the property of Hugues III de Bouville, Olivier V de Clisson, Jean II de Montmorency, Jean-François de Faudoas d'Averton, Marc-Antoine Front de Beaupoil de Saint-Aulaire and Pierre Marie of Lau d’Allemans. In the 19th century, the towers of the chatelet were enhanced with brick battlements and a slender roof. In 1859 the Corne bridge was rebuilt near the castle washhouse which served as a watering trough for the animals. At the end of the 20th century the mills along the river were demolished. In 1964, the Bonde washhouse downstream of the river which was part of the estate was rehabilitated. On December 20, 1972, the castle was partly listed as a historic monument. The park was listed in 1991 for its fences, canals and paths. the house of Jean Cocteau. Entrance to the J. Cocteau house [This 17th century residence, flanked by turrets, was formerly called the Governor's House. It corresponds to an old outbuilding of the castle in front of which the vassals came to pay homage and faith to their lord. Jean Cocteau bought this house with Jean Marais in 1947 and lived there until his death. Notre-Dame de l’Assomption Church Founded in the 11th century, the former chapel of the castle, it was rebuilt around 1485 on the orders of Admiral de Graville in the Gothic style of the 13th and 14th centuries. The bell tower, 57 meters high, dates from the 11th century in its lower part and from the 12th and 13th centuries in its upper part. The arch of the main portal in the primitive Romanesque style comes from an old church in Milly (Saint-Pierre or Saint-Jacques). On the east side of the bell tower - Place Grammont side - the arms of Admiral de Graville are still visible. Many works of sacred art are found inside the church. The church was listed as a Historic Monument in 1926. The dovecote; Located on the old triangular square of the dovecote cul de sac, this old building was part of the Domaine du Moustier, property of Fulbert I, lord of Milly and officer at the court of Dagobert I in the 7th century. Destroyed in 1432 or 1433, the complex included a vast farm. According to a count in 1792 it had around 1200 niches. Only the lords held the right to build these premises designed for breeding. The Moustier de Péronne gate is one of the oldest vestiges of Milly and dates from the 7th century. It provided access to the moustier (monastery in old French) owned by Fulbert I, who obtained the land of Milly from Dagobert I. His son Wulfran was born there around the year 635. Entering religion, he became the apostle of the frieze (Netherlands), then bishop of Sens before retiring to Saint Wandrille where he died in 720.
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The routes traverse diverse landscapes, including extensive forests, agricultural plains, and the winding École River valley. You'll encounter sandstone formations and rolling hills, particularly within the Gâtinais Français Regional Natural Park and the nearby Fontainebleau Forest. This mix offers varied cycling experiences, from flatter sections to more challenging ascents.
Yes, Oncy-Sur-École offers a good selection of routes for beginners. There are over 80 easy touring cycling routes available. An example of an easy route is the Oncy-sur-École MTB Loops loop from Milly-la-Forêt, which is 9.3 miles (14.9 km) long with minimal elevation gain.
For experienced touring cyclists seeking a challenge, there are over 25 difficult routes. The Coquibus Pond – Platière de Coquibus loop from Oncy-sur-École is a difficult 29.8 miles (47.9 km) trail that explores diverse landscapes and sandstone formations, featuring over 400 meters of elevation gain.
Yes, many touring cycling routes in the area are designed as loops, allowing you to start and finish in the same location. For example, the Cul du Chien Rock – Beautiful forest loop from Oncy-sur-École offers a moderate 29.0 miles (46.7 km) path through scenic forests and past notable rock features.
The region is rich in natural beauty and historical sites. You can explore the Mont Grippon massif, the École river, and the vast forests of Fontainebleau and Oncy-Sur-École. Notable natural monuments include the Béorlots Sand Dune, Rocher de Corne-Biche, and Les sables du Cul de Chien.
Absolutely. Beyond natural sights, you can cycle to cultural points of interest. The Domaine de Courances, a beautiful castle, is accessible, as is the unique sculpture The Cyclop. The nearby town of Milly-la-Forêt also offers historical charm.
The touring cycling routes around Oncy-Sur-École are highly regarded by the komoot community, with an average rating of 4.4 stars from over 120 reviews. Cyclists often praise the extensive forests, varied terrain, and the peaceful, rural character of the area.
Many of the easy and moderate routes are suitable for families, especially those with paved or well-maintained paths and less elevation gain. Routes like the Domaine de Courances – Le Cyclop by Jean Tinguely loop from Oncy-sur-École, at 21.4 km, offer a manageable distance and interesting sights for a family outing.
Routes often start from central points within Oncy-Sur-École or nearby towns like Milly-la-Forêt, where public parking is generally available. While specific parking lots aren't detailed for each route, starting points are typically chosen for accessibility.
Oncy-Sur-École is a commune in the south of Essonne, France. While specific public transport links directly to trailheads are not detailed, you can often reach the general area by regional bus services or train to nearby larger towns, and then cycle to your chosen starting point. It's advisable to check local transport schedules for the most up-to-date information.
The region is enjoyable for touring cycling throughout much of the year. Spring and autumn offer pleasant temperatures and beautiful scenery, especially with the changing foliage in the forests. Summer provides longer daylight hours, though it can be warmer. Winter cycling is possible, but some paths might be muddy or require more robust gear.
Yes, if you're looking for a shorter ride, the Oncy-sur-École MTB Loops loop from Milly-la-Forêt is a great option. It's an easy 9.3 miles (14.9 km) route that can be completed in under an hour, perfect for a quick exploration of the forest terrain.


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