Here are some of the specific locations used:
* Jasper National Park, Alberta: This was a major location, with scenes filmed in the Athabasca Valley, the Sunwapta Pass, and the Columbia Icefield.
* Banff National Park, Alberta: Scenes were filmed in the Bow Valley, including the area around Lake Louise.
* Yoho National Park, British Columbia: The iconic Spiral Tunnels were featured in the film.
* Glacier National Park, Montana: A few scenes were shot in the park across the border in the United States.
The film's producers chose these locations because they offered stunning scenery that captured the rugged and remote atmosphere of the story. The use of actual mountain passes, tunnels, and harsh weather conditions added to the realism of the film.