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Visitor centre – Naturum Kosterhavet

The main entrance to the national park is on South Koster - here you'll find all the information you could possibly want about the strange and rare life that goes on beneath the surface. A large and visual exhibition, underwater films and an aquarium allow visitors to get up close and personal with some of the otherwise inaccessible deep-sea species. Naturum also organises a range of guided tours and lectures throughout the year. ...
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Snorkelling in the Koster Sea

Beneath the surface of Kosterhavet National Park lies one of Sweden's most beautiful underwater landscapes. With a Cyclops you can soar over meadows of swaying seaweed, swim through forests of kelp and glide along colourful rocky cliffs. Here you can also try one of the Kosterhavet snorkelling routes, at Rörvik just north of Ekenäs on South Koster. ...
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Flora and fauna

For those interested, Koster is a paradise. On Koster you can experience a rich and varied nature - from heaths and vast pebble fields on North Koster to the lush landscape of South Koster with deciduous forests, flower-rich dry meadows and inviting beaches. The Koster Islands Nature Reserve is surrounded by Sweden's most species-rich marine area, the Kosterhavet National Park. ...