page_title: Canada–United States border
section_title: Land border crossings
hierarchical_section_title: Canada–United States border / Crossings and border straddling / Land border crossings
caption_attribution_description: English: Ambassador Bridge
context_page_description: The Canada–United States border, officially known as the International Boundary, is the longest international border in the world between two countries. Shared between Canada and the United States, the border belongs to the second- and third-/fourth-largest countries by respective area. The terrestrial boundary is 8,891 kilometres long, of which 2,475 kilometres is the border of Alaska with British Columbia and Yukon. The agencies currently responsible for facilitating legal passage through the international boundary are the Canada Border Services Agency and U.S. Customs and Border Protection.
context_section_description: Currently there are 119 legal land border crossings between the United States and Canada, 26 of which take place at a bridge or tunnel. Only 2 of the 119 crossings are one-way, the Churubusco–Franklin Centre Border Crossing, where travellers may enter only the United States; and the Four Falls Border Crossing, where travellers may enter only Canada.
  There are six roads that have unstaffed road crossings, and do not have border inspection services in one or both directions, where travellers are legally allowed to cross the border. Those that cross are required to report to customs, which are stationed further inland.
caption: The Ambassador Bridge between Michigan and Ontario, is the busiest border crossing on the international boundary
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