The caves of Regulus are located in the commune of Meschers-sur-Gironde, about ten kilometres from Royan, in Charente-Maritime. Like the nearby Matata caves, they are a tourist site open to visitors for part of the year.

The caves of Regulus are a group of troglodytic dwellings built in natural cavities over the centuries. Natural cavities, resulting from the usual dissolution phenomena in the limestone, and enlarged over the centuries by man, have served for centuries as habitat or refuge. Prehistoric man lived in them; later, the poor built a dwelling there.

In the 8th century, according to tradition, the Saracens dug silos in the terraces, which are still visible and which were later used to hide the salt from smuggling in order not to pay the gabelle tax.

Even later, at the time of the Wars of Religion, Protestants gathered in these caves to celebrate their worship. Tradition has also made it a den of pirates and wreck diggers: history has thus retained the name of a certain "Cadet", who, still according to tradition, guided ships over the reefs with a lantern hung on the horns of a ram walking on the shore, misleading the sailors and causing their shipwreck.

In the 19th and 20th centuries, when the town was overwhelmed by the great popularity of sea bathing, the caves were either private dwellings (the last inhabitant, Marie Guichard, died in 1923), or "guinguettes" where people came to relax after bathing. Some are transformed into second homes by rich bourgeois (Hennessy family, famous cognac producers, for example...).