The Laurentian Mountains, also known as the Laurentians or Laurentides, are a mountain range in Canada. The range is 1,448 km long and ranges in height from 500 m with peaks over 1,000 m. The Laurentian Mountains extend across Labrador and Quebec within the Laurentian Upland, which contains foothills in northeastern Ontario. The range is located near t…The Laurentian Mountains, also known as the Laurentians or Laurentides, are a mountain range in Canada. The range is 1,448 km long and ranges in height from 500 m with peaks over 1,000 m. The Laurentian Mountains extend across Labrador and Quebec within the Laurentian Upland, which contains foothills in northeastern Ontario. The range is located near the rivers of Ottawa, St. Lawrence, and Saguenay. The Laurentian Mountains primarily stretch across multiple regions in Quebec, with geologic formations such as the Jacques-Cartier Massif located within the range.