Lincolnshire, Nottinghamshire and Staffordshire have Northern characteristics and include satellites of Northern cities. Towns in the High Peak borough of Derbyshire are included in the Greater Manchester Built-Up Area, as villages and hamlets there such as Tintwistle, Crowden and Woodhead were formerly in Cheshire before local government boundary changes in 1974, due to their close proximity to the city of Manchester, and before this the borough was considered to be part of the Greater Manchester Statutory City Region. More recently, the Chesterfield, North East Derbyshire, Bolsover, and Derbyshire Dales districts have joined with districts of South Yorkshire to form the Sheffield City Region, along with the Bassetlaw District of Nottinghamshire, although for all other purposes these districts still remain in their respective East Midlands counties. The historic part of Lincolnshire known as Lindsey (in essence the northern half of the county) is considered by many to be northern, or at least a larger part of Lincolnshire than merely the north and northeast Lincolnshire districts. The geographer Danny Dorling includes most of the West Midlands and part of the East Midlands in his definition of the North, claiming that "ideas of a midlands region add more confusion than light". Conversely, more restrictive definitions also exist, typically based on the extent of the historical Northumbria, which excludes Cheshire and southern Lincolnshire, but notable not Lindsey which was first Northumbrian. Personal definitions of the North vary greatly and are sometimes passionately debated. When asked to draw a dividing line between North and South, Southerners tend to draw this line further south than Northerners do. From the Southern perspective, Northern England is sometimes defined jokingly as the area north of the Watford Gap between Northampton and Leicester – a definition which would include much of the Midlands. Various cities and towns have been described as or promoted themselves as the "gateway to the North", including Crewe, Stoke-on-Trent, and Sheffield. For some in the northernmost reaches of England, the North starts somewhere in North Yorkshire around the River Tees – the Yorkshire poet Simon Armitage suggests Thirsk, Northallerton or Richmond – and does not include cities like Manchester and Leeds, nor the majority of Yorkshire. Northern England is not a homogeneous unit, and some have entirely rejected the idea that the North exists as a coherent entity, claiming that considerable cultural differences across the area overwhelm any similarities. Geography Through the North of England run