Armorica is an ancient name given to a part of Gaul which includes the Brittany peninsular and the land between the rivers Seine and Loire. The name comes from the Gaulish place name Aremorica, which means "the place by the sea", the romans mistakenly believed that this local name referred to the entire region and therefore used it for the territory as a whole.
Armorican Passage Grave is a term used to describe a group of Passage Grave monuments with similar features found roughly in the area known as Armorica, it includes several examples on the Channel Islands.