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A transportation barrier is a natural barrier like mountains, rivers, oceans, etc that blocks or slows the way of transportation.
barrier barÂ·riÂ·er (bÄr'Ä-Ér) n. A structure, such as a fence, built to bar passage. A boundary or limit. An obstacle or impediment. Something that separates or holds apart. Something immaterial that obstructs or impedes behavior. A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations.