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In page Wolin:

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Archaeological finds on the island are not very rich but they dot an area of 20 hectares, making it the second largest Baltic marketplace of the Viking Age after Hedeby.[citation needed] Some scholars have speculated that Wolin may have been the basis for the semi-legendary settlements Jomsborg and Vineta. However, others have rejected the identification, or even the historical existence of Jomsborg and Vineta (for example, Gerard Labuda).[1]