Tower E is on the northern side of the bastion of Su Nuraxi (15th-13th century B.C.).

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

From the courtyard, through a long curved corridor that runs between the curtain wall of the bastion and the keep, one enters the entrance foyer of the perimeter tower (figs. 2, 3), 3.70/1.00 metres long and 0.75/1.03 metres wide.

Fig. 2 - Detail of the courtyard where the entrance door to the chamber of tower E can be seen in the centre. (photo by Unicity S.p.A.).

Fig. 3 - Entrance foyer to tower E(from Lilliu 1962, Table LXV.2, page 337).

To the left of the corridor entrance, there is a semi-circular sentry box, that changed during Phase C (12th-10th centuries B.C.) into a basin to collect rainwater. Tower E that was originally formed by two chambers one above the other, has a base diameter and vault height of 4.40 metres x 8.40 metres. There is a circular well (internal diameter 1.11/2.30 metres, depth 2.15 metres) in the centre of the room, with an internal floor and mouth made from rough stones arranged in rows, dated to Phase C, inside which the bronze handle of a Nuragic bucket used to draw water has been recovered.

Fig. 4 - Chamber in tower E (from Lilliu 1962, Table LXV.1, page 337).

The double row of embrasures made in the lower chamber wall is larger than the one in the other towers in the bastion: there are ten embrasures in the lower row and eight in the upper row. When the bastion wall was redone, the embrasures were closed up (fig. 4).