Fact Sheet: Beyond the Border Facilitating Travel at the United States - Canada Border

At 5,525 miles (8,891 kilometers), the United States-Canada border is the longest shared border in the world. The border, which crosses various terrains and environments, is a diverse region consisting of major metropolitan centers, integrated bi-national communities, numerous transit hubs, tribal lands, and vast regions with little or no population. It is also a dynamic border with accessibility and security requirements that vary significantly with the seasons.

Source: http://www.dhs.gov/ynews/fact-sheets/20111207-btb-facilitating-travel-united-states-canada-border.shtm

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