(Ὄρθα/Órtha, Ὄρθη/Órthē). There were possibly two places with this name in Thessalia.
 Place in Perrhaibia
According to the Homeric Catalogue of Ships (Hom. Il. 2,739), O., with Elone and Olosson, was part of the region of the Polypoetes and therefore situated in Perrhaibia (Perrhaebi). Various ruins at Elasson are identified as O.
 Town in southern Thessalia
There are Hellenistic coins with the legend ΟΡΘ(Ι)ΕΩΝ/ORTH(I)EŌN (HN 30…