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Nigeria
Practice Relating to Rule 36. 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.
Nigeria’s Military Manual (1994) states: “Preplanned protected zones are established by agreement between belligerent parties … [including] demilitarised zones”. 
Nigeria, International Humanitarian Law (IHL), Directorate of Legal Services, Nigerian Army, 1994, p. 43, § 14.
The Report on the Practice of Nigeria states that it is Nigeria’s opinio juris that the protection of demilitarized zones is part of customary international law. 
Report on the Practice of Nigeria, 1997, Chapter 1.8.