Edessa lies just under 300 kilometres north of Palmyra as the crow flies, and its Aramaic dialect, known today as Syriac, is closely related to that of Palmyra.
2005, Sebastian P. Brock, “Greek and Latin Words in Palmyrene Inscriptions: A comparison with Syriac”, in Eleonora Cussini, editor, A Journey to Palmyra: Collected Essays to Remember Delbert R. Hillers, E. J. Brill, page 11