Border area
The border area is the area immediately adjacent to the border of a country. In addition to the informal definition, a border area may have a legal definition and delineation, both domestically and due to bilateral agreements. Reasons for legal definition of a border area include enhanced security and special provisions for the residents of border areas to cross the border.
In the United States, a 100-mile border zone from the border was created, in which Customs and Border Protection’s officials have authority for stop and search.
For Schengen States, a regulation for local border traffic at external borders define a border area which may extend to a maximum of on either side of the border. An exception is made for Kaliningrad Oblast, see "Poland–Russia border" article for details.
In the Soviet Union of the Interbellum and post-World War II periods, the border areas were subject to severe ethnic cleansing of nationals of "potentially hostile" ethnicities; see Population transfer in the Soviet Union and Forced settlements in the Soviet Union#Deportations from border territories in 1939–1941 for details.
In China, during the Chinese Civil War, many of the areas controlled by the communists were called 'Border Areas', because they were in remote districts on the borders of two or more provinces. They are also known by the names of 'Border Regions' and 'Liberated Areas' in English. Examples include the Shaan-Gan-Ning Border Region and the neighbouring 晋-察-冀 Jin-Cha-Ji Border Area in North China.
