It has a population of 17,394 at the latest census in 2001 it is the second smallest of the 5 committee areas in the Scottish Borders.
It is the traditional name for the area drained by the upper reaches of the River Tweed. This area was considered to end before the Yarrow Water flowed into the Tweed, so the area was bounded to the south and east by the Yarrow/Tweed watershed, and to the north and east by the Gala Water/Tweed watershed.