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Netherlands
Practice Relating to Rule 116. Accounting for the Dead
Section C. Marking of graves and access to gravesites
The Military Manual (1993) of the Netherlands provides: “Graves must be properly … marked.” 
Netherlands, Toepassing Humanitair Oorlogsrecht, Voorschift No. 27-412/1, Koninklijke Landmacht, Ministerie van Defensie, 1993, pp. VI-2 and VI-3.
The manual also provides:
As soon as circumstances and the relations between the parties to the conflict permit, the parties, in whose territories graves of the persons who have died as a result of hostilities are located, shall conclude agreements in order: to facilitate access to the gravesites by relatives of the deceased and by representatives of official Graves Registration Services. 
Netherlands, Toepassing Humanitair Oorlogsrecht, Voorschift No. 27-412/1, Koninklijke Landmacht, Ministerie van Defensie, 1993, p. VI-3.
The Military Manual (2005) of the Netherlands states:
As soon as circumstances and the relations between the parties to the conflict permit, the parties whose territory contains graves of persons who died during the conflict must conclude agreements in order:
- to facilitate access to the graves for family members and officials of graves associations; … 
Netherlands, Humanitair Oorlogsrecht: Handleiding, Voorschift No. 27-412, Koninklijke Landmacht, Militair Juridische Dienst, 2005, § 0610.