Related Rule
Practice Relating to Rule 36. Demilitarized Zones
Section A. Establishment of demilitarized zones
Nigeria’s Military Manual (1994) notes that preplanned protected zones, including demilitarized zones, are established by agreement between belligerent parties or can be internationally recognized. 
Nigeria, International Humanitarian Law (IHL), Directorate of Legal Services, Nigerian Army, 1994, p. 43, § 14.