<P> Coordinates: 52 ° 32 ′ N 2 ° 2 ′ W ﻿ / ﻿ 52.533 ° N 2.033 ° W ﻿ / 52.533; - 2.033 </P> <P> The Black Country is a region of the West Midlands in England, west of Birmingham, and commonly refers to all or part of the four Metropolitan Boroughs of Dudley, Sandwell, Walsall and Wolverhampton, In the Industrial Revolution, it became one of the most industrialised parts of Britain with coal mines, coking, iron foundries, glass factories, brickworks and steel mills producing a high level of air pollution . </P> <P> The 14 - mile (23 km) road between Wolverhampton and Birmingham was described as "one continuous town" in 1785 . The first trace of "The Black Country" as an expression dates from the 1840s . The name is believed to come from the soot from the heavy industries that covered the area, although the 30 - foot - thick (10 metre) coal seam close to the surface is another possible origin . </P> <P> Until the late twentieth century, the Black Country had no officially defined borders . Some traditionalists have tended to define it as "the area where the coal seam comes to the surface--so West Bromwich, Oldbury, Blackheath, Cradley Heath, Old Hill, Bilston, Dudley, Tipton, Wednesfield and parts of Halesowen, Wednesbury and Walsall but not Wolverhampton, Stourbridge and Smethwick or what used to be known as Warley". Others have included areas slightly outside the coal field which were associated with heavy industry . </P>

Where does the name black country come from