Grotte du Serment – Mont Aigu loop from L'Œil des nations

Running trails & routes

France

Ile-de-France

Grotte du Serment – Mont Aigu loop from L'Œil des nations

Hard

4.5

(2)

114

runners

Grotte du Serment – Mont Aigu loop from L'Œil des nations

02:50

23.7km

260m

Running

Hard run. Very good fitness required. Mostly accessible paths. Some sure footedness required. The starting point of the route is right next to a parking lot.

Last updated: October 1, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Réserve biologique dirigée des Platières de Franchard (Mare aux pigeons)

Réserve de biosphère de Fontainebleau et du Gâtinais

Waypoints

Start point

Parking

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1.34 km

Perjurer's Cave

Highlight • Other

It's a pretty impressive cave, carved into the rock.

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5.85 km

Grotte du Serment

Highlight • Gorge

The Oath Cave is quite surprising, especially because the vault is made of a single rock. The letters D.F.D were engraved on the cave by Denecourt himself and mean "Last Folie Denecourt".

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6.37 km

Mont Aigu

Highlight • Summit

Mont Aigu culminates at 123 meters above sea level and offers a beautiful panorama over the forest of Fontainebleau. The opportunity to accumulate a little elevation or to do some hill training.

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10.8 km

Caverne Ténébreuse

Cave Entrance

10.9 km

Sandstone with polygonal thermal weathering

Highlight (Segment) • Natural Monument

The sandstones of this region present the peculiarity of a surface which would be like a "lizard skin". She draws small polygons
You will come across several in this valley.
Poecilitic sandstones from the Fontainebleau forest.

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11.9 km

Panorama

Highlight • Viewpoint

Here, you can enjoy a superb panorama over the forest of Fontainebleau. It's nice to take a little break in front of such a beautiful view!

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16.3 km

View from Rocher des Hautes Plaines

Highlight • Viewpoint

In the middle of the Fontainebleau forest, the Hautes Plaines rock offers a magnificent view of the treetops and the Arbonne plain.

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17.4 km

Franchard Isatis

Highlight • Climb

One of the most iconic bouldering spots of the forest!

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20.0 km

The sandstones of Fontainebleau

Highlight • Natural Monument

The Fontainebleau sandstones are sedimentary rock formations. These sandstones are very popular with climbers for their unique texture which provides excellent grip. They are also popular with artists for their …

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