The Ytre Hvaler National Park was set up to preserve a distinctive, large and relatively pristine area in southeast Norway with complete ecosystems on land and in the sea. Coral reefs, varied hard- and soft-bottom communities, stretches with currents and varying depths of water are important elements in the marine natural history.
The national park is in the municipalities of Hvaler and Fredrikstad. In the south, the park borders onto the Kosterhavet Marine National Park in Sweden.
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