The area aroundbordering the Wadden Sea, including the [[Frisian islands]] and the mainland [[tidal marsh|coastal marshes]], is also called the Wadden Coast. In Germany the area is referred to as North Sea Coast (''Nordseeküste''). The polderlands in the Wadden area are referred to in Germany as North Sea [[tidal marsh|coastal marshes]] (''Nordseemarschen''). More recent are terms such as Waddenland, Wadden Aea area and Wadden Sea Region. The latter term is generally understood to include all coastal regions around the Wadden Sea that participate in the trilateral cooperation between Denmark, Germany and the Netherlands. The entire area is known for its rich cultural heritage, dating back to the Roman Iron Age and the Middle Ages, and largely coincides with the area internationally referred to as [[Frisia]].<ref>Linde Egberts and Meindert Schroor (ed.), ''Waddenland Outstanding. History, Landscape and Cultural Heritage of the Wadden Sea Region'', Amsterdam 2018.</ref> Between 2002 and 2023 stakeholder organizations and NGOs from the Wadden Sea Region cooperated in a platform or association called the Wadden Sea Forum (WSF).<ref>{{cite web |url=https://www.waddensea-forum.org/en/ |title=Wadden Sea Forum |last= |first= |date=2023 |website= |publisher=Wadden Sea Forum e.V.|access-date=22 April 2024 |quote=The Forum of the Wadden Sea Region, called Wadden Sea Forum (WSF) was an independent multi-stakeholder, multi-actor platform from Denmark, Germany and The Netherlands and contributed to an advanced and sustainable development.}}</ref>
