Shapur I's inscription at Naqsh-e-Rostam describes the satrapy as "extending to the Caucasus mountains and the Gate of Albania (also known as Gate of the Alans)", but for the most part it was located south of the lower course of the rivers Kura and the Aras (Araxes), bordered on the south by Atropatene, and had the Caspian Sea on its east.