This archipelago is made up of five main islands and a string of islets and reefs that form a circle, inside of which is a shallow, calm sea called "La Chambre", a lagoon with transparent waters. Some 18km offshore, this site has become a nature reserve and home to a botanic species that is found nowhere else in the world: Glénan narcissus. Visit when the weather is fine and bring a mask and snorkel so you can observe the sealife, as well as binoculars for the birds.