Birtha (Greek: Βίρθα), was an ancient town to the southeast of Thapsacus, which Ptolemy (v. 19)[not specific enough to verify] places in 73° 40′ long., 35° 0′ lat. This place, the same as the Birtha of Hierocles, has been confounded by geographers with the town in Osrhoene, which lies much further to the north.[1]
This article incorporates text from a publication now in the public domain: Smith, William, ed. (1854–1857). "Birtha". Dictionary of Greek and Roman Geography. London: John Murray.