Kõinastu is a 2.62 km² islet in the southern part of the Väinameri Sea, Estonia. (retrieved 28 July 2021) Administratively, it forms Kõinastu village which is part of Saaremaa Parish, Saare County. Kõinastu has a population of 4, . There is a light beacon on Kõinastu.

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