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Hiking trails & Routes

Lac d'Olainville – Trévoix Pond loop from Égly

Hiking trails & Routes

Lac d'Olainville – Trévoix Pond loop from Égly

Moderate

4.2

(6)

28

hikers

Lac d'Olainville – Trévoix Pond loop from Égly

04:52

18.5km

160m

Hiking

Moderate hike. Good fitness required. Easily walkable paths. The starting point of the route is accessible with public transport.

Last updated: August 21, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc naturel régional de la Haute Vallée de Chevreuse

Waypoints

A

Start point

Train Station

1

985 m

Lac d'Olainville

Highlight • Lake

After having traveled about twenty kilometers along the barley starting from Morsang sur orge, this lake offered us a magnificent landscape, hidden between the trees.
It was difficult to leave this place to come back home!

Translated by Google •

Tip by

2

1.06 km

Trévoix Pond

Highlight • Lake

A large body of restful and calm water. It is possible to go around on a cycle path.

Translated by Google •

Tip by

3

1.41 km

Trévoix Mill and Trévoix Basin

Highlight • Structure

This mill, private property, can be seen by the gate or above the wall. It is crossed by the Rémarde. The Trévoix basin is a calm and very well-kept place offering pretty bucolic walks and allowing the observation of several avian species.

Translated by Google •

Tip by

4

2.76 km

Wall painting

Highlight • Other

5

16.3 km

Pierre-Beaumirault Menhir and Orge retention basin

Highlight • Monument

Located in a small clearing on a peninsula southwest of the Trévoix basin, this menhir dates from the Neolithic. Easy access on foot or by bicycle, it is, according to Wikipedia, made of a block of Fontainebleau sandstone, roughly triangular, about 1.90 m high, 2 m wide at the base and 0.25 thick m to 0.70 m. He is strongly inclined "from an unknown but ancient date". It would sink into the ground at least 1.5 m deep

Translated by Google •

Tip by

6

18.2 km

Old Washhouse of Ollainville

Highlight • Structure

B

18.5 km

End point

Train Station

Way Types & Surfaces

Way Types

13.8 km

1.48 km

1.45 km

890 m

883 m

Surfaces

7.15 km

6.55 km

2.05 km

1.11 km

898 m

725 m

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Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (120 m)

Lowest point (50 m)

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Weather

Powered by Foreca

Monday 2 November

11°C

4°C

16 %

Additional weather tips

Expect light wind and shifting conditions.

to get more detailed weather forecasts along your route

Comments

August 22, 2024,Bruyères le Châtel en deux boucles

PR 23 of the FFR topoguide “Essonne on foot” extended towards the Château de Courson-Monteloup.

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