Eynhallow Sound
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Eynhallow Sound is a seaway lying between Mainland Orkney and the island of Rousay in the Orkney Islands,[1] Scotland. The tidal indraught is "scarcely felt beyond a line joining Costa Head and the Reef of Quendale".[2] An Iron Age broch, Gurness, has a strategic outlook over the Eynhallow Sound.[3]
