A walk at Cabaret Masson near Fontainebleau

A real walk behind a curious name

Cabaret Masson is neither a theatre nor an inn hidden among the pines. It is the name of a forest starting point beside the D606, in the Rocher Saint-Germain area near the Solle racecourse. The 2024 route sheet published by the Amis de la Forêt de Fontainebleau explains the name: a refreshment stall once appeared here during military exercises, and the memory stayed with the place.

This short loop is a friendly introduction to Fontainebleau Forest. It is not a hunt for sweeping views. Instead, it moves among sand, sandstone blocks, notable trees and a clearing, with six stops that give everyone a reason to slow down. The sheet was designed for groups of children, but it works just as well for adults who want to understand the landscape rather than hurry through it.

Which point to use for the start

A general map of the northern forest still places a pin at 48.440835, 2.689291. It shows Cabaret Masson between Rocher Saint-Germain, Route de Luxembourg, Rocher Cassepot and the racecourse. Several longer routes cross the same area, including blue trails 4 and 12, the GR 1 and the Tour du Massif de Fontainebleau.

That wider view helps with orientation, but it is not a turn-by-turn plan for this loop. The 2024 AFF sheet puts the start at 48.44036, 2.68975, just beside the other pin. Use this more recent point. There is another easy source of confusion: the overview gives four hours for the whole of blue trail 4, while the Cabaret Masson walk uses only part of it.

The current loop at a glance

• Distance: 2.6 km.
• Time shown: about 2 hours, including stops.
• Start: Cabaret Masson car park beside the D606.
• First direction: at the barrier, take the southernmost branch of blue trail 4.
• What to carry: the AFF sheet, saved to your phone or printed.

Two hours for 2.6 km may sound generous. The timing allows for the observation stops, rocky passages and route finding. A walk with children also includes time for the group to come back together. Treat the figure as room to enjoy the route, not a target to beat.

Follow these landmarks in order

From the barrier, the blue trail first leads towards a notable oak marked with a blue circle. The second stop shows work designed to limit erosion. Here the route sheet says to keep beside the large clearing on your left and ignore the branch heading right.

The path then reaches the Cyclope, a boulder marked with a blue star. Farther on, a blue Q identifies the passage known as the Défilé des cinq caveaux, which quarry workers created for Claude-François Denecourt. The letters, numbers and stars belong to the history of Fontainebleau’s blue walking trails. Do not confuse them with the small coloured arrows and numbers used on climbing circuits.

After the stop about mosses and lichens comes the most important junction. The route leaves the blue trail, passes through the Grotte de Robert le Diable, marked with a P, and turns left onto Route Haüy. At the next junction it turns left again, immediately, onto Route de Luxembourg. A final stop looks at the life supported by dead wood before the path returns towards Cabaret Masson and its large clearing.

What the six stops reveal

The first oak is more than a convenient landmark. The route sheet gives it a circumference of 4.25 metres and explains that its blue circle marks a notable tree chosen by the AFF with the ONF. Similar circles have been added elsewhere without authorisation. If several marks appear to lead in different directions, return to the route shown on the sheet rather than searching for another tree.

At the second stop, look at the ground as well as the trunks. Wooden steps keep feet on one line, while small protected patches allow vegetation to recover. On the edge of a sandstone plateau, repeated shortcuts expose roots and send sand downhill. Using the steps is therefore part of following the route, not a needless detour.

The Cyclope provides a geology lesson on the spot. The forest’s sand was deposited when a sea still covered the Paris Basin around 37 million years ago. In some layers, silica cemented the sand into sandstone beds. Erosion exposed the plateaux, and their edges eventually broke into blocks. The Cyclope’s shape makes more sense when you see it as one moment in that very slow process.

The blue Q tells a more human story. Claude-François Denecourt began laying out his blue trails in 1842, joining rocks, caves and viewpoints to which he gave names. The Défilé des cinq caveaux is partly a passage cut by quarry workers whom he paid. Knowing this makes it easier not to assume that every rocky corridor is entirely natural.

Around the fifth stop, the colours are quieter. The AFF sheet recorded 675 lichen species in the forest in 2023. You do not need to identify them to notice the difference between a crust fixed to the sandstone, a leaf-like thallus and cushions of moss. Beneath some dry overhangs, tiny funnels in the sand may be traps dug by antlion larvae. Look closely without putting a finger or stick into them.

The Grotte de Robert le Diable joins these natural details to the memory of the trail. The sheet records an image of the Virgin painted on the rock here in 1880 and maintained since then. Just beyond it, finding the correct exit towards Routes Haüy and de Luxembourg demands more attention than the cave itself.

The final stop shows brown rot gradually breaking down the cellulose in dead wood. Small holes may come from insects, while larger ones may have been made by a bird looking for them. The large clearing then changes the mood once again. The sheet notes that open habitats occupy only a small part of the forest and can support nightjars, woodlarks, insects and bats at different times of year. These are possibilities, not a wildlife checklist promised on every visit.

A forest at a child’s pace

The passages beneath rocks make this loop fun for children who are comfortable walking on uneven ground. Short does not mean smooth, however. Sand slows the pace, roots catch unwary feet and rocks can be slippery. Shoes with a decent grip, water and an extra layer are more useful here than a crowded schedule.

The walk crosses boulders used for climbing, including a white-marked children’s circuit. Climbing is a separate activity with its own guidebook and suitable supervision. A climbing arrow is not a walking direction. In wet weather, enjoy the shapes without climbing them and give the sandstone time to dry.

The six stops also help the forest make sense. Bare ground shows how repeated footfall can speed up erosion. Mosses and lichens settle on the boulders. A dead tree feeds fungi, insects and birds, while the clearing supports species that need sunlight. Stay on the existing route: close observation does not require turning over dead wood or picking plants.

Arrive and leave without a surprise

The AFF sheet says the D606 car park can take a coach and has room for it to turn. That does not replace a check on the day. A barrier, forestry work or a safety closure always takes priority over a downloaded guide. Never leave a vehicle in front of emergency access.

If you are not driving, plan the last leg before leaving home. The route sheet begins at a roadside car park and does not describe a walk from a railway station. Check both outward and return journeys for your date with Île-de-France Mobilités, and leave time to reach your connection.

Checks to make on the morning

Following the July 2026 fires, the ONF regularly updates its map of open and closed forest areas. A diversion may not yet appear on an older base map. If a sign closes the trail, choose another walk. After a fire or in strong winds, a weakened tree can fall without an obvious warning.

In autumn and winter, also consult the Fontainebleau state forest hunting calendar and read temporary notices on site. In summer, do not set out when access is restricted because of fire danger. These quick checks are far better than discovering a closure halfway round.

Save something for another day

Rocher Cassepot looks very close on the map, but improvised links become confusing among the forest junctions. Follow this loop as described on a first visit. Our Rocher Cassepot walk gives you another way into the same broad area next time. A short walk that makes sense often leaves a better memory than a long day spent searching for the right path.