Northern Rocky Mountains
The Northern Rocky Mountains, usually referred to as the Northern Rockies, are a subdivision of the Canadian Rockies comprising the northern half of the Canadian segment of the Rocky Mountains. While their northward limit is easily defined as the Liard River, which is the northward terminus of the whole Rockies, the southward limit is debatable, although the area of Mount Ovington and Monkman Pass is mentioned in some sources, as south from there are the Continental Ranges, which are the main spine of the Rockies forming the boundary between British Columbia and Alberta. Some use the term  to mean only the area north of the Peace Arm of the Williston Reservoir, and in reference to Northern Rocky Mountains Provincial Park, while others consider the term to extend all the way south, beyond the limit of the Hart Ranges at Mount Ovington, to include the McBride area, the Sir Alexander Group and Mount Robson. The area south of the Williston Reservoir,- the Hart Ranges - is much more accessible and better-known, while north of Lake Wililston the Northern Rockies are extremely remote and rarely visited or photographed. The Hart Ranges are traversed by BC Highway 97 (the John  Hart Highway) and the Peace River extension of the former BC Rail line (now part of Canadian National Railways), which use the Pine Pass, and also by the Tumbler Ridge spur line to the Sukunka River coalmines. The Alaska Highway traverses the northernmost part of the range via Stone Mountain and Muncho Lake Provincial Parks. Provincial parks. In addition to Northern Rocky Mountains Provincial Park, other parks in the Northern Rockies are: