Kerdonis lighthouse, Integral lighthouse in Locmaria, France.

Kerdonis is a maison-phare at the eastern tip of Belle-Île-en-Mer, in Locmaria, Morbihan: a white rectangular masonry building with a grey pitched roof and grey stone quoins at the corners. A central door reached by three steps and a tall round-topped window on each side are framed in grey stone. An orange-red cylindrical lantern room with a domed top, finial and railing sits at the right end of the roof.

The Kerdonis lighthouse is a maison-phare on the eastern tip of Belle-Île-en-Mer, in Locmaria, Morbihan. On 18 April 1911 keeper Alexandre Matelot died after a malaise while cleaning the lens; his wife Eugénie Bedex and their children kept the partially dismantled mechanism turning by hand all night. A letter by M. Raissac, tax collector on Belle-Île, published in Le Figaro on 6 June, spread the story, and on 16 June the state awarded Mme Matelot the médaille d'honneur des travaux publics.

The light's red flashes, three grouped every 15 seconds and visible 15 nautical miles out, are coded as Fl(3) R 15s 15M on SHOM chart 7033. The 1911 death of keeper Alexandre Matelot while cleaning the lens, and his family's night of hand-cranking the partly dismantled mechanism, became a national story; Théodore Botrel wrote the song Les Petits Gardiens du feu about them.

The lighthouse is not watched over and cannot be visited; it is seen from outside, from the Pointe de Kerdonis at the eastern end of Belle-Île-en-Mer. Its red light flashes three times every 15 seconds and is visible 15 nautical miles out to sea, as marked on SHOM chart 7033.

The light flashes three red bursts every 15 seconds and reaches 15 nautical miles, as coded FI(3) R 15s 15M on SHOM chart 7033. The sequence runs 3 seconds on, 3 seconds off, 3 seconds on, 3 seconds off, 9 seconds on, for a 15-second cycle.