The sacred nuragic well of Su Cherchizzu is located 387 metres above sea level, a little higher than the nuraghe Santa Sabina.
By comparing it with other similar sites in Sardinia, the well was dated by Professor Giovanni Lilliu to the Bronze Age and, more precisely, by the scholar Maud Webster, to the Late Bronze Age.
After its discovery in 1881, it remained buried for 101 years until, in 1982, following excavation and restoration works conducted by the Archaeological Superintendency of Sassari, a small portion of the structure and a few ceramic fragments were brought to light.
Constructed of basalt and only partially preserved, the well appears to be one of the smallest on the island.
The characteristic staircase, five metres long and between 50 and 70 cm wide, has an irregular shape and is made up of twenty steps. The stepped ceiling has only partially been preserved. A tiny cella can be seen with an ogival cross-section, a residual height of two metres and a diameter at the base of 1.5 metres.
The existence or otherwise of an atrium has not yet been established.
The south-facing entrance of the well no longer has an architrave, which appears to have become detached from the original structure and now lies upturned on the steps.
The wall facing is well preserved, especially in the small cella.
Given its proximity to the Santa Sabina nuraghe, it is possible the two structures were directly linked in the past.