The complexes of 'Sas Lozas' and 'Isterridolzu' are located in the rugged tufaceous slopes that slope towards the Tirso river, in Barigadu, a region of central Sardinia.
The necropolis of Isterridolzu is composed, at the current state of research, of 6 very damaged hypogeans.
The entrances to the tombs, facing S/SE, are preceded by a short pavilion (tombs II and III) or by a “dromos” (tombs I, IV and V). Tomb VI has a direct access door. The implants are multicellular, with 2/5 compartments. The entrance doors, external and internal, are often framed by relief frames. Among the sacred elements, there are votive dimples, generally dug into the anticell floor, small niches for offerings and red painting, a symbol of blood and regeneration.
The most important hypogeum is Tomb I, with 'dromos' (lungh. m 7.55), an anticell and two cells. The anticella, quadrangular (m 2.10 x m 2.30; alt. m 1.45), shows walls with a straight profile and a ceiling sloping slightly towards the entrance. In the floor is a votive dimple. On the back wall, raised above the floor, the access door to the first cell opens, in line with the antecell; the quadrangular compartment (m 1.55 x m 1.35; alt. 1.10 m) with curvilinear walls and a slightly concave ceiling, it has on the left, raised above the floor, the access door to the second cell. This is sub-rectangular (m 3.15/2.80; alt. m 1.65) with rectilinear walls (entrance and bottom) and irregularly curvilinear.
The Sas Lozas complex consists of 5 domus, 4 of which are grouped together, the fifth about 100 m N/E of the previous ones.
The planimetric types are varied: with a centripetal development (tomb I), with a transverse development (tomb IV, with two rooms and a large rectangular cell with a sloping ceiling), with a longitudinal projection (tombs II and III, respectively bicellular and multicellular with a semicircular anticell covered by a sloping ceiling). Tomb V, partially destroyed, is not easily readable. The hypogeans show interesting architectural and decorative motifs: “semi-shield” ceilings with raised beams (tomb cell I; semicircular compartment of tomb II; tomb III, without figurative composition), sloping ceilings with perpendicularly arranged beams (tomb IV), walls and ceilings with strips and pilasters in relief (tombs I, II, IV), grooves and votive pits. The most interesting and articulated domus in the complex is Tomb I, although it has been seriously damaged and remodeled. It consists of six environments arranged around a larger cell “A”, originally preceded by an anticell. The rectangular “A” cell (m 5.20 x m 2.50/2.70; alt. 2.75/2.35 m), preserves in the ceiling the traces of the representation of a sloping roof with 5 beams carved in negative relief; these rest laterally on a relief band below the ceiling line and on corner pilasters, of which only one is visible on the left. On the left wall, the hatch for compartment “B” opened, irregularly quadrangular, with concave-convex walls and an irregular ceiling. An opening in the S/O wall of this room leads to a small subcircular cell with a flat ceiling. On the same wall, 1.20 m from the floor, there are the remains of a hatch that led into the compartment c.
Returning to cell “A”, on the right side, there is access to the “F” and “G” rooms, both irregular in plan and almost completely collapsed; on the back wall of the cell a, in a central position, a semiconic pillar (alt. cm 0.90; width. m 1.05 base, m 0.50 top) with three pedaloles allows access to the “D” compartment. The trapezoidal hatch is framed by a triple framed recess. The “D” cell, quadrangular (m 1.80 x m 1.60; alt. 1.30 m) and raised by 1.50 m compared to the previous room, it has straight walls. On wall E, raised by 0.75 m, there is another room with a subquadrangular wall opening (m 1.80 x m 1.70; alt. m 1.00).
The necropolises can be dated to the final Neolithic — Eneolithic.

History of excavations
The site was investigated in the last decades of the last century.

Bibliography
M. R. Nieddu, “The domus the janas necropolis of Isterridorzu in Sorradile (Oristano)”, in Sardinia, Papers from the EAA third annual meeting at Ravenna 1997, 3, series “BAR international series”, 719, edited by A. Moravetti, M. Pearce, M. Tosi, Oxford, Archaeopress, 1998, pp. 127-128, figg. 1-4;
M. R. Nieddu, “The necropolis at Domus de Janas de Sas Lozas in Sorradile (OR)”, in Bolotanesi Notebooks, 25, 1999, pp. 399-407.

How to get there
To reach the sites of Sas Lozas and Isterridolzu, you must leave the town of Sorradile in the direction of Bidonì; after passing this last center, proceeding in the direction of Olzai, after about 7 km you cross the Lochele bridge. Leave the car and continue walking along a mule track on the left, heading north; you cross the height of Mandra Puzzones until you reach the low plateau of Sas Lozas, close to the river, where the necropolis is located. The domus of Isterridolzu are located just beyond Sas Lozas, further downstream.