A wandering border between Spain and France swaps every six months
Pheasant Island is a tiny uninhabited landmass in the Bidasoa River that switches its national sovereignty between Spain and France twice a year under a centuries-old treaty.
Pheasant Island holds the unique title of the world's oldest condominium, a territory governed jointly by two nations. Since the Treaty of the Pyrenees in 1659, Spain has managed the island from February through July, while France takes control for the remaining six months.
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