Lucania (Greek: Λευκανία Leukanía) was an ancient area of Southern Italy. It was the land of the Lucani, an Oscan people. It extended from the Tyrrhenian Sea to the Gulf of Taranto. It bordered with Samnium and Campania in the north, Apulia in the east, and Bruttium in the south-west—at the top of the peninsula which now called Calabria. It thus comprised almost all the modern region of Basilicata, the southern part of the province of Salerno (the Cilento area) and a northern portion of the province of Cosenza. The precise limits were the river Silarus in the north-west, which separated it from Campania, and the Bradanus, which flows into the Gulf of Taranto, in the east. The lower tract of the river Laus, which flows from a ridge of the Apennine Mountains to the Tyrrhenian Sea in an east-west direction, marked part of the border with Bruttium.
Almost the whole area is occupied by the Apennine Mountains, which here are an irregular group of lofty masses. The main ridge approaches the western sea, and continues from the lofty knot of mountains on the frontiers of Samnium, in a mostly southerly direction, to within a few miles of the Gulf of Policastro. From then on it is separated from the sea by only a narrow interval until it enters Bruttium. Just within the frontier of Lucania rises Monte Pollino, 7,325 ft (2,233 m), the highest peak in the southern Apennines. The mountains descend in a much more gradual slope to the coastal plain of the Gulf of Taranto. Thus the rivers which flow to the Tyrrhenian Sea are of little importance compared with those that descend towards the Gulf of Tarentum. Of these the most important are the Bradanus (Bradano), the Casuentus (Basento), the Aciris (Agri), and the Siris (Sinni). The Crathis, which forms at its mouth the southern limit of the province, belongs almost wholly to the territory of the Bruttii, but it receives a tributary, the Sybaris (Coscile), from the mountains of Lucania. The only considerable stream on the western side is the Silarus (Sele), which constitutes the northern boundary, and has two important tributaries in the Calor (Calore Lucano or Calore Salernitano) and the Tanager (Tanagro or Negro) which joins it from the south.