Zitat

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The island is a condominium,[2] the world's smallest,[3] under joint sovereignty of Spain and France, and for alternating periods of six months is officially under the governance of the naval commanders of San Sebastián, Spain (1 February – 31 July) and of Bayonne, France (1 August – 31 January). In practice, it is administered respectively by the mayors of Irun (in Gipuzkoa, Spain) and Hendaye (in the Pyrénées-Atlantiques, France).

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https://en.wikipedia.org/wiki/Pheasant_Island

Some un-usual island