HALIAKMON (or Haliacmon) was a River-God of Makedonia and Pieria in northern Greece.
The streams of the River Haliakmon flowed through Makedonia to the north of Mount Olympos and the Thessalia. The two major neighbouring rivers were the Axios to the north, and Baphyras in the south.
HALIACMON (Haliakmôn), a son of Oceanus and Thetys, was a river god of Macedonia. (Hes. Theog. 341; Strab. vii. p. 330.)
Source: Dictionary of Greek and Roman Biography and Mythology.
Hesiod, Theogony 337 ff (trans. Evelyn-White) (Greek epic C8th or 7th B.C.) :
"Tethys bore to Okeanos the swirling Potamoi (Rivers) . . . Heptaporos and Haliakmon, Grenikos and Aisepos [in a list of rivers]."
- Hesiod, Theogony - Greek Epic C8th-7th B.C.