Transepted gallery grave is a term used to describe a number of similar megalithic chamber tomb

Chamber tomb

A chamber tomb is a tomb for burial used in many different cultures. In the case of individual burials, the chamber is thought to signify a higher status for the interree than a simple grave. Built from rock or sometimes wood, the chambers could also serve as places for storage of the dead from one...

s built across Atlantic Europe

Atlantic Europe

Atlantic Europe is a geographical and anthropological term for the western portion of Europe which borders the Atlantic Ocean. The term may refer to the idea of Atlantic Europe as a cultural unit and/or as an biogeographical region....

 during the Neolithic

Neolithic

The Neolithic Age, Era, or Period, or New Stone Age, was a period in the development of human technology, beginning about 9500 BC in some parts of the Middle East, and later in other parts of the world. It is traditionally considered as the last part of the Stone Age...

 period.

It refers to burial monuments with side rooms extending laterally from a central chamber. They are found at sites in the Loire

Loire

Loire is an administrative department in the east-central part of France occupying the River Loire's upper reaches.-History:Loire was created in 1793 when after just 3½ years the young Rhône-et-Loire department was split into two. This was a response to counter-Revolutionary activities in Lyon...

 valley of France, south west Great Britain

Great Britain

Great Britain or Britain is an island situated to the northwest of Continental Europe. It is the ninth largest island in the world, and the largest European island, as well as the largest of the British Isles...

 and in Ireland

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

and it is thought the builders had cultural links with one another.