The Kervilor-Mané Bras site in La Trinité-sur-Mer is located atop a rocky ridge in a clearing within a wooded area. A hiking trail passes very close to this monument, a listed historic monument since 1927.
A large oval tumulus houses three passage graves, with the entrance facing east-south-east. The tumulus is made of earth and stone; several stones are visible on the surface of the tumulus.
A large number of excavation and restoration campaigns have been conducted on the monument since plans of it were first drawn up by the members of the Polymathic Society in 1867. The third, less visible dolmen to the south was not discovered until the excavation by Zacharie Le Rouzic in 1898.