An autonomous coastal people of the Arabis (Hab) and Hingol valleys in what is now Las Bela, at the eastern edge of Gedrosia — the Greek name for the dry Makran coast. Arrian records that the Oritae had never been subject to the Persians; they were still independent when Alexander the Great reached them in 325 BC on his return march from India. He stormed their country, founded a city (Rambacia, refounded as an Alexandria) among them and left a garrison, after which they passed into the Hellenistic and then Mauryan orbit. Their western neighbours along the barren shore were the Ichthyophagoi, the “fish-eaters” of the Greek geographers — a way of life, not one nation — while the interior belonged to the Achaemenid satrapy the Greeks called Gedrosia (Old Persian Maka).
Subdued by Alexander the Great in 325 BC, who founded a city (Rambacia / an Alexandria) among them and installed a satrap and garrison; thereafter the Oritae fell under Hellenistic and then Mauryan control and ceased to appear as an independent people.
The Landmark Arrian: The Campaigns of AlexanderArrian (ed. James Romm; trans. Pamela Mensch) · 2010
Arrian’s Anabasis is the primary narrative of Alexander’s campaign against the Oritae and the march through Gedrosia; this is the standard annotated English edition.
The Geography of StraboStrabo (trans. H. C. Hamilton & W. Falconer) · 1854
Strabo, Geography Book XV, preserves Nearchus’s and Onesicritus’s accounts of the Oritae, the Ichthyophagi and the Gedrosian coast — one of the fullest classical descriptions of the region.