It is one of the most refined examples of architecture linked to the worship of the waters from the Nuragic age, with incredibly precise measurements and geometries. The sacred well of Predio Canopoli is found in Perfugas, right in the town centre, and was discovered in 1924 by the owner of the land, from which the well got its name. The building is entirely made from limestone ashlars, probably from the Laerru quarries and worked with extreme care: there are no mortars or binders and the stones are laid dry, in blocks inserted with incredible precision, forming two walls connected by T-shaped or dovetailed ashlars. The building and installation of the blocks made using the opus isodomum technique bring to mind those of the well at the Sanctuary of Santa Cristina in Paulilatino.