Located in the commune of Billiers, in the Morbihan, the lighthouse Pen Lan takes place at the mouth of the Vilaine. Listed in the general inventory, it was built at the end of the 19th century, electrified in 1955 and automated in 1995.
Almost 18 meters high, it takes the form of a square tower contiguous to the facade of a red and white smooth masonry building.
