The Nlakaüpamux or Nlakapamuk ( ; ), also previously known as the Thompson, Thompson River Salish, Thompson Salish, Thompson River Indians or Thompson River people, and historically as the Klackarpun, Haukamaugh, Knife Indians, and Couteau Indians, are an Indigenous First Nations people of the Interior Salish language group in southern British Columbia. Their traditional territory includes parts of the North Cascades region of Washington.
Frontier-era histories and maps transliterate the name Nlakaüpamux as Hakamaugh or Klackarpun; they were also known as the Kootomin, or Couteau (Knife). or Knife Indians. In the dialect of the Thompson language used by the Ashcroft Indian Band, the variant Nlüakapxm is used.
The Nlakaüpamux of the Nicola Valley, who are all in the Nicola Tribal Association reserves refer to themselves as Scwüexmx and speak a different dialect of the Thompson language. Together with the Spaxomin people, a branch of the Okanagan people (Syilx) who live in the upper Nicola valley and also belong to the Nicola Tribal Association, they are collectively known as the Nicola people, or Nicolas.
Blueberries (Vaccinium myrtilloides) are traditionally used by the Nlakaüpamux in pies. They have used the leaves of sedge (Carex) as brushes for cleaning and also as forage for their livestock.
The Nlakaüpamux were the object of both Anglican and Roman Catholic missionary efforts in the nineteenth century, resulting in the vast majority belonging to one of the two denominations by the beginning of the twentieth century.
The Nlakaüpamux Nation Tribal Council despite its name does not include all Nlakaüpamux people, but is one of two main tribal bodies within the region, the other being the Nicola Tribal Association. The Lytton First Nation or Lytton Band, focussed on the town of the same name, which is named Camchin or Kumsheen in the Nlakaüpamux language and is one of the largest Nlakaüpamux communities, does not belong to any of the three tribal associations. While the Upper Nicola Band is affiliated with the Scwüexmx Tribal Council it is a Syilx community and part of the Okanagan Nation Alliance it is not Nlakaüpamux and has a different traditional territory than the other Nlakaüpamux Bands.
None of the Nlakaüpamux governments are in the British Columbia Treaty Commission process at present.
The Nlakaüpamux speak an Interior Salishan language named ', usually transliterated as Nlakaüpamuxtsn and known in English as the Thompson language. The Scwüexmx of the Nicola Valley speak a dialect also called Scwüexmx.
Compiled by Laurence C. Thompson and M. Terry Thompson