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The cairn is an artificial stony heap. Generally in the shape of pyramid where of cone, they realize the progress of a path, the limit of a crest, the peak of a summit. They are very important by time of fog. They also realize the approach of a dangerous point (cliff, …). He is of custom that the walkers contribute to the preservation in good condition cairns, if need be, by adding it stones to their passage, so that the path is always marked out well and the visible progress.