Arctic and subarctic territories, Canada is often considered a country only of the far north; however, the peninsula of southern Ontario juts deeply south into the heartland of the United States, and its southernmost point, Middle Island in Lake Erie, is at the same latitude as northern California. The country also includes several major islands, including Baffin, Ellesmere, Victoria, Newfoundland, and Melville, and many small ones. Its border with the U.S., the longest border in the world not patrolled by military forces, extends 8,890 km. 3. Mountains, lowlands Canada's vast area means it has many varying types of terrain, much of which is mountainous. The Cordillera in the west, the Appalachians in the southeast, the mountains of northern Labrador and of Baffin Island in the northeast, and the Innuitian Mountains in the north form its high edge. A large interior basin centred on Hudson Bay and covering nearly four-fifths of the country is composed of the
organization and the physical arrangements that reflect this organization are highly compartmented, with numerous checkpoints, and employees are not permitted to enter areas in which they do not work without special permission. Colored badges limit them to their own areas. Pistol- packing guards block the entrance to specially restricted areas. The most secret documents must be locked in three-tumbler safes except when analysts are actually working on them—and these areas are also patrolled night and day. Offices that generate the least confidential documents in quantity may store them in desks or in file cabinets, sometimes unlocked, but these offices are under constant armed guard. When classified papers must be taken from N.S.A. to other agencies, employees must not go alone if they use a private car but must travel in pairs. They must keep the papers in a locked briefcase and must store them overnight in a safe stowage either at the other agency or at N.S.A.;
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