The Occupied Enemy Territory Administration (OETA) was a joint British, French and Arab military administration over the Levantine provincesĀ ā which had been part of the Ottoman Empire for four centuriesĀ ā between 1918 and 1920, set up on 23 October 1918 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 preceded 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 19ā26 April 1920 San Remo conference.