Occupied Enemy Territory Administration

The Occupied Enemy Territory Administration (OETA) was a joint British, French and Arab military administration over Levantine provinces of the former Ottoman Empire between 1917 and 1920, set up on 23 October 1917 following the Sinai and Palestine Campaign and Arab Revolt of World War I. Although it was declared by the British military, who were in control of the region, it was followed on 30 September 1918 by the 1918 Anglo-French Modus Vivendi in which it was agreed that the British would give the French control in certain areas, and the Hashemites were given joint control of the Eastern area per T.E. Lawrence's November 1918 "Sharifian plan".

Following the occupation of the Adana Vilayet (the region of Cilicia) in December 1918, a new territory, OETA North, was set up. The administration ended in OETA West and OETA South in 1920 following the assignment of the Mandate for Syria and the Lebanon and British Mandate for Palestine at the 19–26 April 1920 San Remo conference.

In OETA East, British administration ended following the withdrawal of British forces from the territory in November 1919, and the subsequent declaration of the Arab Kingdom of Syria over the same area. The area was split into two after the French defeated King Faisal in July 1920; the northern part of the territory was combined with the French-administered OETA West, and the southern part became a no man's land and later became the Emirate of Transjordan.

Due to the success of the Turkish War of Independence, Marash, Aintab and Urfa sanjaks of former Aleppo Vilayet remained in Turkey after 1921. Also, Antakya and İskenderun kazas of Aleppo Sanjak in one were separated as the Republic of Hatay in 1938; the republic then instead became a part of Turkey in 1939.