By the time of the first of these wars, the southward expansion of Rome's territory had reached the River Liris (see Liri), which was the boundary between Latium (land of the Latins) and Campania. This river is now called Garigliano and it is the boundary between the modern regions of Lazio and Campania. In those days the name Campania referred to the plain between the coast and the Apennine Mountains which stretched from the River Liris down to the bays of Naples and Salerno. The northern part of this area was inhabited by the Sidicini, the Aurunci and the Ausoni (a subgroup of the Aurunci). The central and southern part was inhabited by the Campanians, who were people who had migrated from Samnium (land of the Samnites) and were closely related to the Samnites, but had developed their distinctive identity. The Samnites were a confederation of four tribes who lived in the mountains to the east of Campania and were the most powerful people in the area. The Samnites, Campanians and Sidicini spoke Oscan languages. Their languages were part of the Osco-Umbrian linguistic family, which also included Umbrian and the Sabellian languages to the north of Samnium. The Lucanians who lived to the south were also Oscan speakers.