Iran's western borders are with Turkey in the north and Iraq in the south, ending at the Shatt al Arab (which Iranians call the Arvand Rud). The Persian Gulf and Gulf of Oman littorals form the southern border (1,770 kilometres). To the east lie Afghanistan on the north and Pakistan on the south. The distance from the Iran's border with Azerbaijan in the north-west to the border with Pakistan in the south-east is about 2,333 kilometres.