La Pierre à Martin est l'un des 20 géosites aménagés du Géoparc mondial UNESCO du Chablais. Elle mesure 9 m de long, 6 m de large et 7,30 m de hauteur. Elle pèse l'équivalent de 217 mammouths ! Des panneaux d’interprétation sur place dévoilent son histoire géologique et bien des légendes.
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