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An internally displaced person is someone who is forced to flee his or her home but who remains within his or her country's borders. They are often referred to as refugees, although they do not fall within the current legal definition of a refugee. At the end of 2006 it was estimated there were 24.5 million IDPs in some 52 countries. The region with the largest IDP population is Africa with some 11.8 million in 21 countries. (via Freebase)