You bump into them everywhere when hiking in Haute-Savoie: on the Aravis ridges, in the scree fields of the Giffre, atop a Chablais pass. Cairns are those little piles of stacked stones, set there like silent beacons to help you find your way when painted waymarks are scarce.
Where does the cairn come from?
The word comes from Scottish Gaelic càrn, meaning a pile of stones. But the object itself is far older than the word: prehistoric cairns are found all over Europe, some more than 5,000 years old. Originally they marked important places — graves, boundaries, crossing points. Today, in the mountains, their role is much more practical: marking the path of a trail when neither vegetation nor paint can do so.
What a cairn is actually for
Imagine yourself crossing a vast scree field above 2,000 m. No vegetation, no obvious track in the stones, and painted waymarks on the rocks that fade each winter. That is where cairns become precious. You spot one ahead, then another a little further on — you move from cairn to cairn the way a boat moves from buoy to buoy.
A good cairn is visible from far away (several dozen metres ideally) and placed strategically: at a change of direction, the start of a trail, a tricky passage.
Good practice: building (or not building) a cairn
There are a few rules to know. The first, and the most important: do not move stones to build a cairn where one is not needed. In some national parks (Écrins, Vanoise) building wild cairns is actively discouraged, even forbidden: it disturbs ecological balances (habitat for reptiles, insects, lichens) and can mislead other hikers who might follow a "fake" cairn.
If you do decide to build one where it is truly useful:
- Only use stones found immediately nearby
- Lay the biggest stones flat at the base first
- Stack upwards progressively, alternating shapes to stabilise
- Finish with a slightly larger or lighter stone to improve visibility
- Step back 20-30 m and check it is visible from both directions of travel
What if a cairn looks suspicious?
Trust your IGN map and your GPS first. An isolated cairn that leads you in an odd direction should be treated with caution — it may be the result of a mistake, a joke, or simply a hiker who wanted to mark a spot that did not need marking. A cairn is a help, not an absolute truth.
In Haute-Savoie you will see plenty of them on long pasture traverses and on rocky ridges. Look at them, use them, respect them — and remember that each one was placed by someone who was thinking of you before you ever walked past.