The Saint-Michel tumulus is a megalithic grave mound, located east of Carnac in Brittany, France.

[1] It is the largest grave mound in continental Europe.

[1] Explored in 1862, researchers found there a central vault containing fairly prestigious funerary furniture: axes, pearls, flint tools and sillimanite.

It has been classified as a "Monument historique" (National heritage site) since 1889.

Around 1900, the archaeologist Zacharie Le Rouzic [fr] again excavated the Saint-Michel tumulus and discovered a second dolmen and fifteen small stone chests, thus revealing the complexity of this monument.