Kosterhavet National Park is the first national marine park in Sweden, inaugurated in September 2009. It is part of the Skagerrak sea and is located in Strömstad and Tanum municipalities in Bohuslän, Västra Götaland County, Sweden. It consists of the sea and shores around the Koster Islands, excluding everything else on the islands. In the north, it borders the Norwegian marine park of Ytre Hvaler.
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