In 1925 Britain and Italy signed a boundary treaty, whereby the 22nd parallel north was utilised starting at the tripoint with Egypt and proceeding westward, terminating at the border between Italian Libyan and French Equatorial Africa (i.e. the modern Chad-Libya border).[1][2] The north-west corner of Anglo-Sudan Egyptian thus created was referred to as the Sarra Triangle; this latter area was ceded to Italy on 20 July 1934, and the boundary re-drawn at its current position.[2] On 7 January 1935 France and Italy signed a treaty which shifted the French Equatorial Africa-Libya boundary southwards (creating the Aouzou Strip, thereby also shifting the Libya-Sudan southwards slightly, however this agreement was never formally ratified by both parties and was thus never implemented.[7][2]