This man is stand­ing on the U.S. / Cana­di­an bor­der on a minor moun­tain range. The image faces north, with British Colum­bia in the back­ground. The bor­der is 8,891 kilo­me­tres (5,525 miles) long… and a lot of it is like this. In one place in Yukon Ter­ri­to­ry, it is 18,000 feet above sea lev­el and sur­round­ed by hun­dreds of miles of glac­i­ers. A tem­per­a­ture of −77.5 °C (−107.5 °F) has been record­ed there. A long por­tion cuts through the mid­dle of the Great Lakes, and bisects Nia­gara Falls. In the old­er, east­ern por­tions it pass­es through the mid­dle of small towns. In one case, it cuts diag­o­nal­ly through a pub­lic library, indi­cat­ed by a black line paint­ed on the floor. The book check-in and check-out are in dif­fer­ent countries.