The Trilateral Wadden Sea Plan (WSP) is the common policy and management plan for the protection and sustainable management of the Wadden Sea Area. It is also the common management plan for the Wadden Sea World Heritage Site. A unique and basic feature of the Wadden Sea Plan is that it aims at achieving the full scala of habitats, which belong to a natural and dynamic Wadden Sea. Each of these habitats, for which common trilateral Targets have been adopted, needs a certain quality (natural dynamics, absence of anthropogenic disturbance, absence of pollution), which can be reached by proper management of the area.
More about the Wadden Sea Plan is here.