Mané-Groh dolmen, Megalithic tomb in Erdeven, Brittany, France

The Mané-Groh dolmen is a Neolithic megalithic tomb located in Erdeven, in the Morbihan area of Brittany, France. It consists of a roughly 20-foot (6-meter) granite corridor leading into a rectangular chamber divided into four sections by stone slabs.

The dolmen was built during the Neolithic period, when communities in this part of Brittany began raising large stone monuments to bury their dead. It was originally covered by a round earthen mound, known as a tumulus, which has largely disappeared over time.

Carvings on one of the entrance stones show shapes that look like a hatchet, a club, and a ring. These marks were made by the people who built the dolmen, and their exact meaning remains open to interpretation today.

The site is open-air and easy to walk around, allowing visitors to approach the corridor and chamber from different angles. Wearing sturdy footwear is a good idea, as the ground around the stones can be uneven.

About 40 meters northwest of the main dolmen, at the edge of an old quarry, lies a second, completely ruined dolmen. Only two perpendicular supports and a capstone lying on the ground remain. The German source places it northwest, matching the French source.