The complex is in the center of the Cabu Abbas plain, in Meilogu, a region of northwestern Sardinia.
The nuraghe, one of the jewels of Proto-Sardinian architecture, consists of a keep and a three-lobed bastion. Around it there is a town of circular nuragic huts and rectangular buildings from the Roman age.
The keep - circular (diam. m 15.50; h. res. m 17.55), originally with three floors and terrace - is built at the base with irregular rows of freshly sketched basalt blocks and, above, by horizontal rows of smaller, perfectly shaped ashlars.
The rectangular entrance (m 0.78x1.62), surmounted by an architrave with an exhaust window, opens to S-E. It leads into a flat entrance (m 5.40 x1.53; h m 2.60) where the entrance staircase opens, in a small way, and a ring corridor (width m 1.20; h m 3.15); this goes around the room to which it is connected by three large entrances with an exhaust vent.
The corridor is illuminated by 9 trumped-up louvers placed at a regular distance.
A trapezoidal opening above the lintel at the entrance to the chamber leads into an elliptical compartment (width m 1.60; h m 4) illuminated by a window and equipped with an open draining hatch on its floor.
The chamber is circular (diam. m 5.25; h m 7.93).
The staircase (width m 1.30; h m 2.60), with a helical development and an ogival section with short inclined sections, rises to the upper floors and to the terrace.
It is illuminated by slits and shows an elliptical cell with two niches and a slot at the beginning of the route.
It then leads to the entrance of the first flat floor (m 1.85x1.25; h m 2.20) illuminated by an arched window with an exhaust vent.
The room on the first floor, circular (diam. m 4.85; h m 5.33), is equipped with a bench-seat and two raised niches, the first equipped with a louver.
The staircase then leads to the second floor chamber, remaining for the base row (diam. m 4.25; h m 1.45). It has an O-shaped entrance and shows a deep well closet on the floor (width 1.60-2.45 m; depth 2.40 m).
A final ramp originally led to the terrace.
The bastion (m 38.80 x m 39; h m 9) - with two floors - encloses two towers and the courtyard on the front, and later incorporates a third tower placed in line with the entrance and the keep.
The entrance to the bastion, trapezoidal (m 0.80x1.82), is made of the S-E curtain. Closed by a powerful lintel surmounted by an exhaust window, it leads into the flat entrance - with a large niche on the left - that flows into the courtyard.
This has a sub-trapezoidal plan (m 19.25x7.05) and is equipped with a well with a parapet (diam. m 0.55; depth m 5). The entrances to the two front towers, the corridors on the ground floor and the stairs that lead to the upper floors overlook it.
The secondary towers, circular (diam. m 5.40-5.70; h m 6) and equipped with numerous loopholes, connect to the courtyard with short arched spaces and to the rear tower with long galleries that develop parallel to the curtains; the galleries have an angular section (length m 23, width m 2; h m 4) and are illuminated by numerous openings. The corridors are connected to each other and to the courtyard through transverse openings.
The rear tower (diam. m 5.80; h m 7.55), the only one with an external entrance (width m 0.80; h m 1.55), has a well (width m 1.50; depth m 2.90).
The raised entrances to the stairs that lead to the upper galleries also open to the inner courtyard.
These (width m 1.50; h m 3) communicate with each other by means of a transverse attachment and show subsidiary compartments with a false vault.
The stairs led with a second ramp, partially preserved, to the stands of the bastion.
The chronological phases of the complex range from Middle Bronze to Iron (construction of the keep, erection of the three-lobed bastion, construction and subsequent construction phase of the village) to its use in historic times. The materials from the excavations are visible at the Museum of the Valley of the Nuraghi del Logudoro-Meilogu in Torralba.

History of excavations
The nuraghe was excavated for the first time in 1935 by Antonio Taramelli. Subsequent excavations and restorations were conducted by Guglielmo Maetzke (1964), Susanna Bafico and Guido Rossi (1985) and the University of Sassari (2000).

Bibliography
A. Taramelli, "Il nuraghe S. Antine nel territorio di Torralba", in Monumenti Antichi dei Lincei, XXXVIII, 1939, coll. 10 ss.;
G. Lilliu, I nuraghi torri preistoriche della Sardegna, Cagliari, La Zattera, 1962, pp. 108-113, fig. 8,6;
E. Contu, "Nuraghe Santu Antine (Torralba)", in Rivista di Scienze Preistoriche, XX, 1965, pp. 382-383;
A. Moravetti, "Il nuraghe S. Antine", in Preistoria e Protostoria della Sardegna centro-settentrionale, Sassari, Chiarella, 1978, p. 19 ss;
E. Contu, Il Nuraghe S. Antine, collana "Sardegna archeologica. Guide e Itinerari", Sassari, Carlo Delfino, 1988;
A. Moravetti, "Il nuraghe S. Antine. L'architettura", in Il nuraghe S. Antine nel Logudoro Meilogu, Sassari, Carlo Delfino, 1988, pp. 45-60;
A. Moravetti, "Torralba, Nuraghe S. Antine", in I Sardi. La Sardegna dal paleolitico all'età romana, a cura di E. Anati, Milano, Jaca Book, 1984, pp. 322-324.