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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
Annex I : Draft agreement relating to hospital and safety zones and localities - Art. 4.
Hospital and safety zones shall fulfil the following conditions:
(a) They shall comprise only a small part of the territory governed by the Power which has established them.
(b) They shall be thinly populated in relation to the possibilities of accommodation.
(c) They shall be far removed and free from all military objectives, or large industrial or administrative establishments.
(d) They shall not be situated in areas which, according to every probability, may become important for the conduct of the war.
Commentary of 1958