Columbia Mountains

The Columbia Mountains are a group of mountain ranges along the Upper Columbia River in British Columbia, Montana, Idaho and Washington. The mountain range covers 135,952 km². The range is bounded by the Rocky Mountain Trench on the east, and the Kootenai River on the south; their western boundary is the edge of the Interior Plateau. Seventy-five percent of the range is located in Canada and the remaining twenty-five percent in the United States; American geographic classifications place the Columbia Mountains as part of the Rocky Mountains complex, but this designation does not apply in Canada. Mount Sir Sandford is the highest mountain in the range, reaching.

Mountain ranges

The Columbia Mountains are made up of four large ranges containing many subranges:

Additionally lower areas to the west of the main ranges are sometimes included in the description of the Cariboo Mountains:

Some classification systems end the Columbia Mountains at the North Thompson River, such that the Cariboo Mountains are assigned to the Interior Plateau. Where the Columbia Mountains meet the Interior Plateau there are intermediary areas known as highlands - the Quesnel Highland, the Shuswap Highland, and the Okanagan Highland. These are listed here but are often considered to be part of the Interior Plateau.
Some geographic classifications also include the Cabinet Mountains and Salish Mountains, which lie south of the Purcells between the Kootenai River and the Clark Fork of the Columbia, but in US classification systems they are generally considered to be part of the Rocky Mountains.
Physiographically, they are a distinct province of the larger Rocky Mountain System physiographic division.

The following mountains are the 10 highest mountains contained within the Columbian Mountains:

The following passes are located within or on the perimeter of the Columbia Mountains:

One of the most restricted Canadian endemic species, Phemeranthus sediformis, the Okanogan fameflower, is native to the Okanagan Highland, the Columbia Mountains, and the Kettle River Range between Kelowna and the northern Colville Reservation border in Washington State.