Greater Tunb Seventeen miles southwest of Qeshm, the island of Tunb is situated on the north of the Gulf's median line. This island's distance from the Iranian port of Bandar Lengeh is 30 miles, and it is situated at more than 46 miles from the Emirate of Ras al-Kheimah. The term tunb is Tangestani dialect (southern Persian) which means hill. In his book of a journey through Iran and the Persian Gulf, the famous British diplomat James Morier, states:

Since Tunb is located relatively far from the entrance to the Persian Gulf, its strategic value, individually, is far from being significant. However, from the perceived Iranian strategic viewpoint, Tunb is highly valuable as it forms part of the Iranian defence line against the entrance of the Strait of Hormuz.