Origins and Migration of the Salish Tribes The Salish tribes, often referred to collectively as the Interior Salish or Pacific Coast Salish, depending on region, are part of a larger language family known as the Salishan languages. These peoples traditionally lived across a wide swath of the Pacific Northwest, including what is now Montana, Idaho, Washington, British Columbia, and parts of Oregon. Linguistic evidence suggests that the Salishan peoples may have originated along the Pacific Coast, gradually migrating inland over…