The Trent basin covers a large part of the Midlands, and includes the majority of the counties of Staffordshire, Derbyshire, Leicestershire, Nottinghamshire and the West Midlands; but also includes parts of Lincolnshire, South Yorkshire, Warwickshire and Rutland. The catchment is located between the drainage basins of the Severn and its tributary the Avon to the south and west, the Weaver to the north-west, the tributaries of the Yorkshire Ouse to the North and the basins of the Welland, Witham and Ancholme to the east.