Saudi Arabian–Iraqi neutral zone

The Saudi–Iraqi neutral zone was an area of 7,044 km² on the border between Saudi Arabia and Iraq within which the border between the two countries had not been settled. The neutral zone came into existence following the which defined the border between Iraq and the Sultanate of Nejd (Saudi Arabia's predecessor state). The neutral zone officially ended in 1981, when Iraq and Saudi Arabia agreed on the partition of the zone.

The Treaty of Muhammarah (Khorramshahr), 5 May 1922, forestalled the imminent conflict between the United Kingdom, which held the mandate for Iraq, and the Kingdom of Nejd, which later became Saudi Arabia (when combined with the Kingdom of Hejaz). The treaty specifically avoided defining boundaries. Following further negotiations, the (Uqayr), 2 December 1922, defined most of the borders between them and created the neutral zone.

No military or permanent buildings were to be built in or near the neutral zone and the nomads of both countries were to have unimpeded access to its pastures and wells.

Administrative division of the zone was achieved in 1975, and a border treaty concluded in 1981. For unknown reasons, the treaty was not filed with the United Nations and nobody outside Iraq and Saudi Arabia was notified of the change or shown maps with details of the new boundary. As the Gulf War approached in early 1991, Iraq cancelled all international agreements with Saudi Arabia since 1968. Saudi Arabia responded by registering all previous boundary agreements negotiated with Iraq at the United Nations in June 1991. That ended the legal existence of the Saudi–Iraqi neutral zone.

Most official maps no longer show the diamond-shaped neutral zone but rather draw the border line approximately through the centre of the territory. For example, the United States Office of the Geographer regarded the area as having only an approximate boundary rather than a precise one.

The Saudi–Iraqi neutral zone formerly had the ISO 3166-1 codes NT and NTZ. The codes were discontinued in 1993. The FIPS 10-4 code for the Saudi–Iraqi neutral zone was IY; that code was deleted in 1992.

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