A neutral zone is a delimited zone bordering at least one of the states that has agreed to set up a neutral territory. This has occurred in the past and/or present for:
in the colonial era, the neutral zone between Thailand and French Indochina, 25 kilometres wide (roughly 15.5 miles) on the east bank of the Mekong, was placed under French control but formally remained under Thai sovereignty.
Koalou/Kourou, a 68 km2 area of land between Benin and Burkina Faso containing the villages of Koalou, Niorgou I, and Niorgou II. Since 2009 the area has been administered by the Joint Committee for the Concerted Management of the Kourou/Koalou Area (COMGEC-K).