Trou Miette

Trou Miette is a natural karst cave in the commune of Méailles, in the Alpes-de-Haute-Provence department of southeastern France. Located in the Pelat massif, it has long been known to local cavers and speleology enthusiasts, though it remains largely unknown outside that community.

What is Trou Miette?

It's a modest but geologically interesting cave system carved into Nummulitic limestone dating from the Eocene epoch. The passages run roughly 250 meters in total length, with a vertical drop of about 25 meters. The cave represents a remnant of a former underground river: its upper section has been cut off from the water supply and is now dry, while the deeper stretches still show the shaping influence of past water flow.

What will you find inside?

The defining feature of Trou Miette is its "keyhole" passage shape — near the entrance, ledges and notches carved into the rock are visible, while further in the cave narrows into a pronounced, winding meander. This form is a classic result of centuries of limestone erosion by flowing water: wider upper sections paired with a narrower, more deeply incised channel below.

The cave has been surveyed more than once. The first topographic survey was carried out by Yves Créac'h in March 1951, followed by a second one from D. Fabre in May 1980. Around 1985, caver Michel Isnard reportedly pushed beyond the previously known endpoint, exploring roughly another hundred meters of passage.

How do you get there?

Méailles is a small village in Alpes-de-Haute-Provence, in an area known for mountain hiking trails and the distinctive sandstone formations near neighboring Annot. Trou Miette lies in mountainous terrain outside the village center, within the Pelat massif — reaching the entrance itself requires a hike over unmarked or poorly marked ground.

An important caveat: this is a speleological site, not a show cave with a maintained visitor route. Getting inside, and especially descending the vertical drop, requires caving equipment (harness, rope, helmet with headlamp) along with experience or the company of someone familiar with the terrain. Visitors without speleological training should limit themselves to viewing the surroundings from outside.

When should you visit?

The Alpes-de-Haute-Provence region is best visited in spring, summer, and early autumn, when mountain trails are dry and passable and daylight hours are long enough for exploring the terrain. Inside the cave, temperatures stay fairly constant year-round, but reaching the entrance in winter can be difficult due to snow and ice on the slopes of the Pelat massif.

Frequently asked questions

Can you visit Trou Miette without caving experience? It isn't recommended. The cave has a 25-meter vertical drop and requires the equipment and skills typical of speleology rather than ordinary hiking.

How long is the cave? The passages total roughly 250 meters, part of which is a dry, former section of an underground river.

Who has surveyed Trou Miette? Yves Créac'h carried out the first topographic survey in 1951, followed by D. Fabre in 1980. Around 1985, Michel Isnard explored additional passages beyond the previously known endpoint.

What else is worth seeing near Méailles? The area is known for mountain hiking trails and the striking sandstone formations near nearby Annot, making it appealing for trekking and geology enthusiasts alike.