[Pooya/Ali Commentary 34:17] The old Frankincense route was the great highway between Arabia and Syria. Through Syria it connected with great and flourishing kingdoms of the Euphrates and Tigris (Furat and Dajlah) valleys on the one hand and Egypt on the other, and with the great Roman empire round the Mediterranean. At the other end, through Yemen coast, the route was connected, by sea transport, with India, Malaysia and China. The route was studded, in the days of prosperity, with many cities close to each other. The close proximity of the cities prevented the inroads of highway men.