The sacred well of Tattinu rises among the woods and expanses of asphodels of the locality of the same name on the slopes of Mount Tamara, in the territory of Nuxis, a small town in Sulcis, dotted with testimonies of the past. The first and most evident singularity compared to the 'canonical' Nuragic sacred wells is the apparent absence of the vestibule and any other visible structure. The stairs, with 28 steps, form a rectangular void with the water compartment, just over eight meters long and just over one meter wide. The actual well has a 'bottle' section with an elliptical plan, which is also unusual. It is about five meters high and has a tholos roof. To build it, limestone blocks were used with the insertion of pebbles.