Les baignoires du Docteur Guillon, Historic rock pools on the coast of Royan, France
Les baignoires du Docteur Guillon are stone pools carved into the rocks at Pontaillac, on the coast of Royan in France. The oval and round basins sit right at the water's edge and work with the tides: they fill with seawater as the tide comes in and warm up in the sun as it recedes.
In the 1870s, Doctor Guillon studied scrofula, a skin disease, and had these basins built so that patients could benefit from seawater treatments. A local family financed the construction in 1872, helping to establish Pontaillac as a place people came to for sea cures along the Atlantic coast.
The basins are only fully visible and accessible at low tide, so it is worth checking the tide times before you go. Access is on foot along the Pontaillac shoreline and requires no special equipment, though sturdy shoes are a good idea on the wet rocks.
The basins were connected by small channels that guided water from one pool to the next, creating a simple but carefully thought-out circulation system. This system relied entirely on the natural movement of the tides, with no machinery involved.
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