Realistically speaking, Basrah is not really a port city on the coast of the Persian Gulf, but it could be considered as such because Basrah is a city where the river Shatt al-Arab flows through and joins the Persian Gulf.
The Shatt al-Arab is a river formed by the confluence of the Euphrates and Tigris rivers. So even though it only flows for 200 km, which is not too impressive among other long rivers, the fact that it is a union of two of the longest rivers in the world—the Euphrates, flowing for 2,780 km, and the Tigris, flowing 1,900 km—makes the volume of water contained in the Shatt al-Arab River absolutely massive, making it very wide. In the future, even oil tankers of tens of thousands of tonnes could travel on such a river, much less the 2,000-tonne battleship of the Bharatiya Empire.
