القاعدة ذات الصلة
Peru
Practice Relating to Rule 37. Open Towns and Non-Defended Localities
Section B. Establishment of non-defended localities
Peru’s IHL Manual (2004) states:
When appropriate, special agreements should be made between the parties to the conflict or with neutral States in order to:
(e) permit the marking of non-defended localities … with distinctive signs. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 25.b.(2)(e).
The manual also states:
Improvised protected areas are places where there are no military objectives or activities and which are:
(a) located near or in a zone where armed forces are in contact;
(b) open for occupation by the enemy.
Such areas are called “non-defended localities”. Unlike demilitarized zones (for which an agreement is required), they can be set up by a unilateral declaration made to the adverse party, who must acknowledge receipt of the notification. For greater safety, however, it is recommended that formal agreements also be made for non-defended localities.
The requirements that must be met by demilitarized zones and non-defended localities are practically the same. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 27.h.(2).
Peru’s IHL and Human Rights Manual (2010) states:
When appropriate, special agreements should be made between the parties to the conflict or with neutral States in order to:
(e) Allow the marking with distinctive emblems of non-defended localities. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 26(2)(e), p. 233; see also § 92(b)(5), p. 294.
The manual also states:
Improvised protected areas are places where there are no military objectives or activities and which are:
(a) located near or in a zone where armed forces are in contact;
(b) open for occupation by the enemy.
Such areas are called “non-defended localities”. Unlike demilitarized zones (for which an agreement is required), they can be set up by a unilateral declaration made to the adverse party, who must acknowledge receipt of the notification. For greater safety, however, it is recommended that formal agreements also be made for non-defended localities.
The requirements that must be met by demilitarized zones and non-defended localities are practically the same. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 28(h)(2), p. 241; see also p. 408.
The manual further states: “When enemy land forces are advancing, the possibility of conceding non-defended zones to the enemy must be considered in order to avoid unnecessary loss of life or damage.” 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 31(d), p. 245.