Above sea-level on an isolated hill above the Basento (anc. Casuentus), it is much exposed to winds and has a far more northerly climate than its position (40° 40' N.) implies, and is indeed one of the coldest places in Italy (mean temp. Jan 37.8°, July 70.9°, for whole year 53° F.).
Of these the most important are - the Bradanus (Bradano), the Casuentus (Basiento), the Aciris (Agri), and the Siris (Sinno).
The chief rivers are the Sele (Silarus) - joined by the Negro (Tanager) and Calore (Calor)- on the west, and the Bradano (Bradanus), Basiento (Casuentus), Agri (Aciris), Sinni (Siris) on the east, which flow into the gulf of Taranto; to the south of the last-named river there are only unimportant streams flowing into the sea east and west, inasmuch as here the width of the peninsula diminishes to some 40 m.