Nithsdale (Srath Nid in Scottish Gaelic), also known by its anglicised gaelic name Strathnith or Stranit, is the strath of the River Nith in Scotland, and the name of the region. It is possible that Strath Nid actually represents the Cumbric Ystrad Nidd as Cumbric (arising as it did from the British Language) was the dominant language in this area... Found on http://en.wikipedia.org/wiki/Nithsdale
valley of the River Nith, Dumfries and Galloway region, southwestern Scotland. It comprises the western part of the historic county of Dumfriesshire ... Found on http://www.britannica.com/eb/a-z/n/44