The Caithness, Sutherland and Ross constituency is part of the Highlands and Islands electoral region; the other seven constituencies are Argyll and Bute, Inverness and Nairn, Moray, Na h-Eileanan an Iar, Orkney, Shetland and Skye, Lochaber and Badenoch.
The eight constituencies of the Highlands and Islands electoral region cover most of Argyll and Bute council area, all of the Highland council area, most of the Moray council area, all of the Orkney Islands council area, all of the Shetland Islands council area and all of Na h-Eileanan Siar.