The Kootenay (/ˈkuːtni/ KOOT-nee) region (in common parlance "The Kootenays") comprises the southeastern portion of British Columbia. It takes its name from the Kootenay River, which in turn was named for the Ktunaxa (or Kootenai or Kutenai) First Nation first encountered by explorer David Thompson.
The Kootenays are more or less defined by the Kootenay Land District, though some variation exists in terms of what areas are or are not a part. The strictest definition of the region is the drainage basin of the lower Kootenay River from its re-entry into Canada near Creston, through to its confluence with the Columbia at Castlegar (illustrated by a, right). In most interpretations, however, the region also includes:
Some or all of the following areas to the north, which drain into the Columbia River, are also commonly included in the Kootenays:
When the above regions are added, sometimes the region's name is morphed into Columbia-Kootenay or Kootenay-Columbia, although that terminology also includes the Big Bend Country and Kinbasket Lake, to the north of Golden and Revelstoke, which is not generally considered part of the Kootenays, though part of the Kootenay Land District.