These Strange Borders Will Make You Question Everything You Thought You Knew About Geography

6. Spain and France

Border: Pheasant Island Area: Changes ownership every six months, area not applicable Est. Gross Domestic Product: $3.049 trillion (France) / $1.582 trillion (Spain)*

Nestled in the Bidasoa River, Pheasant Island is a special diplomatic relic that formerly connected France and Spain. Since the signing of the Treaty of the Pyrenees in 1659, the sovereignty of this small, deserted island has changed every six months. Spain and France ©EQRoy/Shutterstock This agreement, which is among the first instances of a condominium, symbolizes a dedication to harmony and equitable collaboration between the two countries. The island itself is a live example of innovative diplomacy and respect for one another; it is closed to the public except during the formal handover of authority. Its past and present functions as a shared region highlight the potential for amicable cooperation and communication in international relations.