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  2. Border - Wikipedia

    en.wikipedia.org/wiki/Border

    Most countries have some form of border control to regulate or limit the movement of people, animals, and goods into and out of the country. Under international law, each country is generally permitted to legislate the conditions that have to be met in order to cross its borders, and to prevent people from crossing its borders in violation of ...

  3. Border control - Wikipedia

    en.wikipedia.org/wiki/Border_control

    While some borders (including most states' internal borders and international borders within the Schengen Area) are open and completely unguarded, others (including the vast majority of borders between countries as well as some internal borders) are subject to some degree of control and may be crossed legally only at designated checkpoints ...

  4. Territorial integrity - Wikipedia

    en.wikipedia.org/wiki/Territorial_integrity

    Territorial integrity is the principle under international law where sovereign states have a right to defend their borders and all territory in them from another state. It is enshrined in Article 2(4) of the UN Charter and has been recognized as customary international law. [1]

  5. Border barrier - Wikipedia

    en.wikipedia.org/wiki/Border_barrier

    A border barrier does not usually indicate the location of the actual border, and is usually constructed unilaterally by a country, without the agreement or cooperation of the other country. Examples of border walls include the ancient Great Wall of China, a series of walls separating China from nomadic empires to the north. The construction of ...

  6. Borders of the United States - Wikipedia

    en.wikipedia.org/wiki/Borders_of_the_United_States

    Passamaquoddy Bay border defined by 1910 treaty. Gulf of Maine partial border defined by 1984 ruling of the International Court of Justice. [1] Land and Great Lakes border defined by the 1783 Treaty of Paris, 1794 Jay Treaty, Treaty of 1818, 1842 Webster–Ashburton Treaty and 1846 Oregon Treaty (all with the United Kingdom). Alaska: Canada

  7. Open border - Wikipedia

    en.wikipedia.org/wiki/Open_border

    Open borders are the norm for borders between subdivisions within the boundaries of sovereign states, though some countries do maintain internal border controls (for example between the People's Republic of China mainland and the special administrative regions of Hong Kong and Macau, or between the United States and the unincorporated ...

  8. List of border control organisations - Wikipedia

    en.wikipedia.org/wiki/List_of_border_control...

    Border control in China is the responsibility of a variety of entities in each of the country's four distinct immigration areas. In the Special Administrative Regions of Hong Kong and Macau, agencies tracing their lineage to British and Portuguese colonial authorities, respectively, perform border control functions based on the policies and practices in force before those territories' return ...

  9. Port of entry - Wikipedia

    en.wikipedia.org/wiki/Port_of_entry

    A port of entry at Shir Khan Bandar in northern Afghanistan near the Tajikistan border.. In general, a port of entry (POE) is a place where one may lawfully enter a country.It typically has border security staff and facilities to check passports and visas and to inspect luggage to assure that contraband is not imported.