They are located in the south of Finistère, near Concarneau and Fouesnant, and comprise nine major islands: Saint-Nicolas, the Loc'h, Penfret, Cigogne, Drenec, Bananec, Brunec, Guiriden and Guéotec.
In addition, there are over a dozen smaller islets as Quignénec, Brilimec or Kastell Bargain.
Île aux Moutons, halfway to the continent, is considered to be a part of the archipelago.
The islands are a popular tourist destination, particularly as a daytrip for those holidaying in the rest of Finistère.
Both the presence of a shallow seabed and the availability of a catamaran with windows in its base have greatly contributed to this.