Bas-Sablons lighthouse, Lighthouse in the Saint-Servan district of Saint-Malo, France

The Bas-Sablons lighthouse is a square masonry tower of three levels, attached to a single-storey terrace building used for storing equipment. It stands on the quay of Bas-Sablons beach in the Saint-Servan district. The tower is painted white with a black top and rises 19.50 metres above its base, reaching 24.96 metres above sea level.

The lighthouse began with traditional light sources, but underwent significant modernization in 1912 when it switched to electrical illumination. This upgrade made it more reliable for the growing maritime traffic of the era.

The tower stands on the quay of Bas-Sablons beach in the Saint-Servan district, a former commune annexed to Saint-Malo. Aligned with the Balue lighthouse, it marks the entrance channel to the port, and its green directional light is automated and remotely monitored.

The lighthouse sits on the coastline and can be viewed from several vantage points around the harbor area. Visitors can see it clearly from the waterfront walkways and nearby public spaces.

In 1944 the tower was spared from demolition the Germans had planned at the time of the Normandy landings, so the 1868 masonry survives. Since 1948 it has served as a fixed green directional light, aligned with the Balue lighthouse to mark the entrance channel to Saint-Malo.