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A boat race which occurs on the first Saturday in August every year. It is one of the largest off-shore races by number of participants. The boats start by "Trälhavet" by Vaxholm in Stockholm archipelago and continues towards the goal line in Öregrund, some 135 nm north. The event is organized by Öregrunds Racerklubb during the final day of Öregrund boat festival week (Öregrunds båtfestivalvecka), and is usually the most crowded day of the year in Öregrund.
One of three active nuclear plants in Sweden, open for group visits.