The necropolis is excavated in a basaltic outcrop that dominates the Riu Mannu valley, along the Suni-Pozzomaggiore provincial road, in the Planargia region, in northwestern Sardinia.
The hypogeic complex (chronologically framed in the final Neolithic period, 3200-2800 BC) includes 12 single-celled and multicellular burials, with access almost always consisting of a vestibule. The rooms, quite modest in size, often keep traces of red paint on the walls.
Tomb I consists of a small rectangular vestibule (width m 0.74; depth m 0.42; height m 0.76) on the back wall of which a semicircular cell opens (depth m 0.72; width m 0.90; height m 0.74), with a vaulted kiln.
Tomb II has a similar development in plan, consisting of a short quadrangular pavilion (width m 1; depth m 0.80/0.66; height m 0.84/0.90) which introduces - through a quadrangular entrance - into a square cell (depth m 1.26; width m 1.20; height m 0.85) with a slightly concave ceiling.
Tomb III is divided into two rooms: a quadrangular cell (depth m 1.70; width m 1.84/1.72; height m 0.86/0.94) with a sloping ceiling towards the entrance - preceded by a small open-air space - and a second quadrangular compartment (depth m 1.34; width m 1.34; width m 1.34; height m 0.90) accessible through a trapezoidal door.
Tombs IV and V have more complex floor plans.
Tomb IV, with a rectangular entrance door equipped with a framed recess (width m 0.44; height m 0.60; thickness m 0.20), consists of three rooms arranged on the transverse axis at the entrance. Cells A (depth m 0.82; width m 1.30; height m 0.66) and B (depth m 0.60; width m 1.26; thickness m 0.66) have a quadrangular plan, while cell C is semi-elliptical (depth m 0.92/0.80; width m 1.50; height m 0.52).
Tomb V - the largest and most complex in the necropolis - has a small pavilion that leads to a cell B, on whose left and back walls open two pairs of communicating cells.
Cell B, trapezoidal (width m 1.14/1.30; depth m 1.30; height m 0.92), preserves a circular dimple in the center of the floor (diameter m 0.18; depth m 0.07).
Tomb VI consists of a small semicircular cell (depth m 0.84; width m 1) with a kiln vault on which a small circular niche opens (depth m 0.50; width m 0.44; height m 0.46).
Tomb VII consists of a circular hallway A (depth m 1.08; width m 0.92/1.43), on the back wall of which the doors of two communicating cells open side by side.
Tomb VIII also has three cells, the first of which, with a recessed hatch, has a curvilinear plan (depth m 0.86; width m 1.08; height m 0.30) and a concave ceiling.
Tomb IX includes a short pavilion or antechamber, followed by two other connecting rooms on the same longitudinal axis.
Tomb X consists of a short pavilion A that leads into a quadrangular compartment B into which two cells (C and D) open. Cell C is characterized by its particular 'L' shape plan. In addition, in the back wall of the compartment, there is a small cabinet-niche (width 0.50 m; height 0.42 m) with a spherical cap.
Tomb XII is excavated in the highest sector of the outcrop. It can be reached with some difficulty from above and includes a quadrangular antecell (depth m 1.30; width m 1.40; height m 1.12/1.10), the main cell with a semi-elliptical shape (depth m 1.10; width m 0.60; height m 0.60/0.84) - with a slightly concave ceiling in the center and sloping towards the entrance - and another environment that is no longer detectable due to the collapse of the ceiling.

History of the excavations
The necropolis has been known since the Taramelli was mentioned in the archaeological map.

Bibliography
A. Taramelli, “Sheet 205, Capo Mannu; Sheet 206, Macomer”, in Archaeological Edition of the Map of Italy at 100,000, Florence, Military Geographic Institute, 1935, p. 186, n. 5;
V. Santoni, “Preliminary note on the type of artificial funerary caves in Sardinia”, in Sardinian Historical Archive, XXX, 1976, figg. 5/40, 6/50; A. Moravetti, “Archaeological Heritage”, in Marghine-Planargia. The socio-economic development plan and the district urban plan of the VIII Mountain Community, 3, 6, 8, Cagliari, 1985, p. 50, fig. 1;
A. Moravetti, “The Planargia from prehistory to the Phoenician-Punic Age”, in La Planargia, Cagliari, Edisar, 1994, p. 94 ff., fig. 100; A. Moravetti, Archaeological Research in the Marghine-Planargia, II, series “Archaeological Sardinia. Studies and monuments”, 5, Sassari, Carlo Delfino, 1998, pp. 256-272.

How to get there
Exit from Suni and take the road to Padria. At km 63, after a double bend, there is, on the right, the trachytic outcrop in which the burials are dug. Leave the car and walk up the slope to the rocky front.