Chabahar Port
Chabahar Port () is a seaport in Chabahar located in southeastern Iran, on the Gulf of Oman. It serves as Iran's only oceanic port, and consists of two separate ports named "Shahid Kalantari" and "Shahid Beheshti", each of which has five berths.
Iran–Iraq relations
The 1937 treaty recognised the Iran–Iraq border to be along the low-water mark on the Shatt al-Arab's eastern side, except at Abadan and Khorramshahr, where the frontier ran along the thalweg (deepest part of the river valley). This gave Iraq control of most of the waterway and required Iran to pay tolls whenever its ships used it.