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Southport Island Marine is a small boat and yacht yard located in the Boothbay Region of Mid-Coast Maine. We are best known as the builder of the elegant and highly regarded DownEast powerboat, the Southport 30. These incomparable beauties have been built here since 1995. These great boats are well regarded for their performance as well as their traditional good looks. We are traditional boat-design lovers that are committed to offering beautiful, modern interpretations of traditional designs.