), one of the most considerable of the rivers of Samnium, which has its sources in the lofty group of the Apennines S. of the Lago di Fucino,
and has a course of above 70 miles from thence to the Adriatic.
It flows at first in a SE. direction, passes under the walls of Aufidena as well as of the modern Castel di Sangro,
and in this part of its course flows through a broad and level, but upland valley, bounded on both Sides by lofty [p. 2.874]
After passing Aufidena it turns abruptly to the NE., and pursues this course till it reaches the sea.
In the lower part of its course it enters the territory of the Frentani, which it traverses in its whole breadth, flowing into the sea between Histonium and Ortona. Strabo indeed represents it as forming the boundary between the Frentani and the Peligni, but this is certainly a mistake, as the Peligni did not in fact descend to the sea-coast at all, and Ortona, one of the chief towns of the Frentani, was situated to the N. of the Sagrus. (Strab. v. p.242
; Ptol. 3.1
§ 19; where the name is erroneously written Σάρος.
) The upper valley of the Sagrus, with its adjoining mountains, was the territory of the Samnite tribe of the Caraceni. (Ptol. 3.1.66