| Canada |
Covering most of the northern part of the North American continent, Canada has an extremely varied topography. In the east the mountainous maritime provinces have an irregular coastline on the Gulf of St. Lawrence and the Atlantic. The St. Lawrence plain, covering most of southern Quebec and Ontario, and the interior continental plain, covering southern Manitoba and Saskatchewan and most of Alberta, are the principal cultivable areas. They are separated by a forested plateau rising from Lakes Superior and Huron.
Westward toward the Pacific, most of British Columbia, Yukon, and part of western Alberta are covered by parallel mountain ranges, including the Rockies. The Pacific border of the coast range is ragged with fjords and channels. The highest point in Canada is Mount Logan (19,850 ft; 6,050 m), which is in the Yukon. The two principal river systems are the Mackenzie and the St. Lawrence. The St. Lawrence, with its tributaries, is navigable for over 1,900 mi (3,058 km).