4 Keeping Your Country Safe Every country has borders A border is the boundary around each country Sometimes the border is marked by a high fence or other barrier such as a river Often the border is the sea coast around the country The boundary between the U S and Canada is the world’s longest undefended border It is 5,525 miles 8,891 km long and crosses land and water FACTS AF Part of the United States Mexico border The U S side is on the left
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