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The line that separates one country from another is
called a border. Sometimes these follow a natural
feature, such as a mountain range or a river. On
other occasions they follow a straight line, ignoring
physical features. ---- However, if there is a
conflict, borders may be heavily guarded, and it is
often difficult to move from one country to another.
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The longest undefended border in the world runs between the US and Canada. |
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Politics can play an important role in the creation of borders, for example when one country seeks independence from another. |
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When countries are on friendly terms, borders can be little more than lines on a map, easily crossed. |
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Generally you can only cross the borders between countries if you have either a passport or the appropriate paperwork. |
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While some countries, like Greenland, do not have borders, other countries, like Switzerland, are surrounded by them. |