Шатт-эль-Араб
The Iran–Iraq border runs for 1,599 km (994 m) from the tripoint with Turkey in the north down to the Shatt al-Arab (known as Arvand Rud in Iran) waterway and out to the Persian Gulf in the south. Although the boundary was first determined in 1639, certain disputes continue, particularly surrounding navigation on the Shatt al-Arab.