The menhir of Cailouan (also known as Cailouan, Kaelonan, Caëlonan, or Kaillouan) stands near a spring in Plésidy, in the Côtes-d’Armor department in Brittany, France.
This granite menhir, one of the tallest in France, is cylindrical with a square base and a tapered, rounded top. It measures approximately 8.0 meters in height, 2.7 meters in width, and 1.7 meters in thickness.








