Fort Smith was founded around the Slave River. It served a vital link for water transportation between southern Canada and the western Arctic. Early fur traders found an established portage route from what is now Fort Fitzgerald on the western bank of the Slave River to Fort Smith. This route allowed its users to navigate the four sets of impassable rapids (Cassette Rapids, Pelican Rapids, Mountain Rapids, and Rapids of the Drowned). The portage trail had been traditionally used by local Indigenous people for centuries.