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In page Svalbard:

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The name Svalbard comes from an older native name for the archipelago, Svalbarð, composed of the well-attested Old Norse words svalr ("cold") and barð ("edge; ridge"). The name Spitsbergen originated with Dutch navigator and explorer Willem Barentsz, who described the "pointed mountains" or, in Dutch, spitse bergen that he saw on the west coast of the main island, Spitsbergen. Barentsz did not recognize that he had discovered an archipelago, and consequently the name Spitsbergen long remained in use both for the main island and for the archipelago as a whole.[1]