The Crathis or Crater (Greek: Κρᾶθις; Italian: Crati) is a river in Calabria, southern Italy. It rises in the central the Sila Mountains, a few kilometers south of Cosenza, flows below the walls of that city, where it is joined by the smaller stream of the Busento, and has a course nearly due north through the center of the Bruttian peninsula, until it approaches the borders of Lucania, when it turns abruptly to the east and flows into the Gulf of Taranto, immediately to the south of the ancient site of Thurii.
At the present day, at a distance of c. 5 km from its mouth, it receives the waters of the river Coscile, which in ancient times pursued its own course to the sea.
From its close proximity to the celebrated city of Sybaris the Crathis is noticed by many ancient writers.[1] Euripides sings its praises, and alludes to the peculiar golden-red tinge it was supposed to impart to the hair, a fact which is also noticed by Ovid and other writers.[2] The plains through which the Crathis flows in the latter part of its course were noticed in ancient times for their fertility: by the 19th century they had become marshy and unhealthy. Like all streams which descend from a mountainous region, and afterwards flow through a flat alluvial tract, the river was subject to violent inundations and sudden changes of its course: during the flourishing days of Sybaris it was doubtless restrained by dams and artificial embankments; and hence when the citizens of Crotona, after their great victory over the Sybarites in 510 BCE, determined to annihilate the rival city, they broke down the banks of the Crathis and turned its waters on to the site of Sybaris.[3] Hence Herodotus incidentally notices the dry bed of the Crathis (v. 45), which was evidently its ancient channel. The same author expressly tells us that the Italian river was named by the Achaeans who founded Sybaris, after the less celebrated stream of the same name in their native country.[4]