Les pierres sonnantes

Les pierres sonnantes is a collection of rocks scattered across the beach in Saint-Cast-le-Guildo that produce metallic tones when struck together. Each stone yields different pitches due to its mineral composition and internal structure.

Local legend attributes these stones to the giant Gargantua, who supposedly scattered them across the area following a massive feast. This story has shaped how people understand and relate to this coastal location over generations.

These singing stones are woven into local storytelling and attract both visitors and residents who come to discover their acoustic properties firsthand. The experience of playing the beach itself connects people to the natural character of this coastal spot.

These stones are located on the beach and accessible via the GR34 coastal walking route heading west from Notre-Dame du Guildo harbor. Visiting at low tide makes them easier to reach and explore without obstruction.

The stones contain amphibolite minerals that give them their distinctive acoustic properties, setting them apart from ordinary beach rocks. This rare geological feature makes them a natural phenomenon found in only a few places worldwide.