The Windscale fire of 10 October 1957 was the worst nuclear accident in Great Britain's history. The county of Cumbria was created in 1974 from the traditional counties of Cumberland and Westmorland, the Cumberland County Borough of Carlisle, along with the North Lonsdale or Furness part of Lancashire, usually referred to as "Lancashire North of the Sands", (including the county borough of Barrow-in-Furness) and, from the West Riding of Yorkshire, the Sedbergh Rural District. It is governed by Cumbria County Council.