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water is the oldest physical barrier. the barrier can be easily overcome with modern modes of transportation. however, inhabitants of some islands risk their lives to overcome this barrier. for example, the communist island of Cuba lies 150 km from Florida. many Cuban citizens have tried the dangerous crossing to Florida in old or leaking boats. most have been picked up the U.S coast guard, only to be returned to Cuba. many have tragically drowned in he attempt.

deserts are another physical barrier. other physical barriers include jungles, swamps, mountains, and the lack of transportation routes (roads).

barriers can also be man-made. for example the Berlin Wall in Germany. it was once a heavily guarded wall splitting Germany into two - west and east Germany. it didnt let anyone escape from east Germany to West Germany. the wall was finally torn down in Germany reunited as one country.

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