The Haliacmon (Attic: Polytonic|Ἁλιάκμων, "Haliákmōn"; Ionic: "Aliákmōn"; Modern Greek: Αλιάκμονας, "Aliákmonas"; South Slavic: Бистрица, "Bistritsa" or "Bistrica"; Turkish: "İnce Karasu") is the longest river in
Greece, with a total length of 322 km (200 miles). "Haliacmon" is the traditional English name for the river, but many sources cite the formerly official katharevousaversion of the name, "Aliákmon". Today, the only official variant is the demotic "Aliákmonas".
It rises in the northern
Pindusmountains in northern Greece on the border with Albania, before flowing southeast then northeast through the Greek peripheries of West and Central Macedoniaand then into Lake Kastoria, and into the dam and into the Thermaic Gulf. It waters an extensive area, making it of great importance to agriculture in the region. The river forms the western portion of the delta of the Axiós(aka Vardar). The river runs in the prefectures of Kastoria, Grevena, Kozani, Imathia, and Pieria.
The Haliacmon flows through
Kastoria, Neapoli, west of Siatistaand into the Grevena prefecture and east of Grevena, and to the south of Kozani and into the Polyfytosdam which is 20 km long and about 4 to 5 km wide, and southeast of Aiane, and into the gorges and southeast of Veriaand north of Aiginioand northeast of Methone.
Claudius Ptolemycalled the chain of mountains in which the river rises (northern Pindus) the "Canalovii". According to Julius Caesar, the Haliacmon formed the line of demarcation between Macedonand Thessaly. In the upper part of its course it took a southeast direction through Elimiotis, which it watered; and then, continuing to the northeast, formed the boundary between Pieria, Eordaea, and Imathia. In the time of Herodotusthe Haliacmon was apparently joined by the Loudias[http://www.sacred-texts.com/cla/hh/hh7120.htm 7, 127] , the discharge of the lake of Pella; but a change has taken place in the course of the Loudias, which no longer joins the Haliacmon, but flows directly into the Aegean Sea. The image below shows a wind gapbetween the Haliacmon and Loudias watersheds that is the probable ancient course of the Haliacmon.
It was the domain of the eponymous river god Haliacmon.
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