Erythras (Ancient Greek: Ἐρυθρᾶς) was a port town of ancient Ionia, near Erythrae. Strabo, whose description proceeds from south to north, after describing Teos, says, "before you come to Erythrae, first is Erae, a small city of the Teians, then Corycus, a lofty mountain, and a harbour under it, Casystes; and another harbour called Erythras." Its site is tentatively located near the modern , Asiatic Turkey.