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#snowshed #avalanche control #mountain pass #terrain divider #natural barrier

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#isthmus #peninsula #land bridge #geographical divider #mountain dividing sea #land separating water #natural barrier

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#obstacle #hurdle #roadblock #impediment #hindrance #difficulty #natural barrier #man-made barrier

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#tree line #property line #natural barrier #windbreak #plant divider

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#barrier reef #natural barrier #ocean separation #atoll boundary

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#windbreak #shelterbelt #wind shield #wind protection #natural barrier #hedge #shrubs

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#continental divide #natural barrier #large separation #geographical division