Corner tower C is on the eastern side of the bastion of Su Nuraxi (15th-13th century B.C.), in a side position (fig. 1).

Fig. 1 - Map of Su Nuraxi, nuraghe and village (from Lilliu 1962, Table LVI.1, page 328).

The perimeter tower (fig. 2) can be accessed from the courtyard, through an architraved door and a corridor 5.20/5.40 metres long and 0.82/1.53 metres wide, originally comprising two chambers one on top of the other, the upper one, with a silo, could be reached from the fortifications of the bastion walls. The base diameter and the vault height are 4.90 x 8.40 metres. 

Inside the chamber, to the left, there is a round cell covered by a vault (2.60/1.80 metres in diameter and 3.86 metres in height), preceded by a low architrave hatch of 1.07 metres height. It is presumed it was used as a bed or to store arms.

Fig. 2 - Detail of the courtyard where the entrance door to the chamber of tower C can be seen on the left. (From Lilliu, 1962, Table LXIII.4, p. 335).

The lower chamber wall had a double row of embrasures that also act to provide light and air; the upper row originally had a wooden walkway that could be accessed from a mobile staircase. When the bastion wall was redone, between the 12th and the 10th centuries B.C., all the embrasures were closed up (fig. 3).

Fig. 3 - Pair of embrasures in the chamber of tower C (From Lilliu, 1962, Table LXIV.3, p. 336).