Thyamis basin

The Thyamis (), also known as Glykys (Γλυκύς) or Kalamas (Καλαμάς), is a river in the Epirus region of Greece. The long, river flows into the Ionian Sea while on its course it drains an area of about , over 99% of which on Greek territory. Thyamis in ancient Greece was mentioned by Pausanias as forming the boundary between Thesprotis and Kestrine. In addition, Suda and Ptolemaeus mentioned it.