Border fence

A border barrier is a separation barrier that runs along an international border. Such barriers are typically constructed for border control purposes, viz. to curb illegal immigration, human trafficking and smuggling.

In cases of a disputed or unclear border, erecting a barrier can serve as a de facto unilateral consolidation of a territorial claim.

Examples include the ancient Great Wall of China, a series of walls separating China from nomadic empires to the north, and the former Berlin Wall between East and West Berlin. The construction of border barriers increased in the early 2000s; half of all the border barriers built since World War II ended in 1945 were built after 2000.

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