In Greek mythology, Xanthos ("yellow") was an alternate spelling for Xanthus. It is also a town in Lycia, Turkey, present day Kumluova.

Xanthos is the greek appellation of the name of the city of Arnna, of lycian origin. The name changed several times as differentnations took power. Xanthus is the later roman appellation for the city and the river, as all the -os suffixes have changed to -us during roman occupation. Xanthos is also the name of the river which passes at the banks of the precipice where Xanthos is situated. During the persian invasion the river is called sirbe which means "yellow" like the greek word xanthos, which also means yellow. the fact is, the river is usually yellow because of the alluvial base of the valley. Today Xanthos overlooks the modern turkish village of Kınık. We see the name Xanthos in Iliad as one of the divine horses of Achilleus the greek. edited by: Iqtazhlah of Antiphellos