Phare des Grands Cardinaux, Lighthouse on the Chaussée des Cardinaux, Morbihan, France

The Phare des Grands Cardinaux stands on the Groguéguez rock on the Chaussée des Cardinaux, southeast of Hoëdic. The cylindrical tower is painted in three horizontal bands—red at the base, white in the middle, and red at the top—and rises from a low, dark rock base. A narrow gallery separates the white band from the upper red section, and a small, dark lantern with a thin finial caps the tower.

Built on the Groguéguez rock of the Chaussée des Cardinaux, southeast of Hoëdic, the lighthouse was completed in 1879, but its light only became operational on 1 January 1880. It marks the approach to the Bay of Quiberon and is now remotely controlled from the Phare de Goulphar. It was inscribed as a monument historique by decree of 10 June 2020.

The tower is listed under the name Grogueguez on marine chart 7033 of the SHOM, after the rock Groguéguez on which it stands. Its light shows four grouped flashes every 15 seconds, with a range of 13 nautical miles. The nearby Chaussée des Cardinaux gave its name to the 1759 Battle of the Cardinals, fought close by.

The tower stands on the Groguéguez rock on the Chaussée des Cardinaux, southeast of Hoëdic, and is not reached on foot from the island; it is seen from the sea or the Hoëdic shore. It is telecontrolled from the Goulphar lighthouse on Belle-Île, so there is no on-site keeper to receive visitors. Approach only with suitable weather and tide.

The lighthouse is remotely operated from the Goulphar lighthouse rather than by on-site keepers as it was once. On marine charts, the structure is still listed under the name of the rock it stands on, Grogueguez.