Wales. But the status of Breconshire or Carmarthenshire, for instance, is more debatable. In the western extent, from Swansea westwards, local people might feel that they live in both south Wales and west Wales. Areas to the north of the Brecon Beacons and Black Mountains are generally considered to be in Mid Wales. The valleys and upland mountain ridges were once a very rural area noted for its river valleys and ancient forests and lauded by romantic poets such as William Wordsworth as well as poets in the Welsh language, although the interests of the latter lay more in society and culture than in the evocation of natural scenery. This natural environment changed to a considerable extent during the early Industrial Revolution when the Glamorgan and Monmouthshire valley areas were exploited for coal and iron. By the 1830s, hundreds of tons of coal were being transported by barge to ports in Cardiff and Newport. In the 1870s, coal was transported by rail transport networks to Newport Docks, at the time the largest coal exporting docks in the world, and by the 1880s coal was being exported from Barry, Vale of Glamorgan. The Marquess of Bute, who owned much of the land north of Cardiff, built a steam railway system on his land that stretched from Cardiff into many of the South Wales Valleys where the coal was being found. Lord Bute then charged fees per ton of coal that was transported out using his railways. With coal mining and iron smelting being the main trades of south Wales, many thousands of immigrants from the Midlands, Scotland, Ireland, Cornwall and even Italy came and set up homes and put down roots in the region. Very many came from other coal mining areas such as Somerset, the Forest of Dean in Gloucestershire and the tin mines of Cornwall such as Geevor Tin Mine, as a large but experienced and willing workforce was required. Whilst some of the migrants left, many settled and established in the south Wales Valleys between Swansea and Abergavenny as English-speaking communities with a unique identity. Industrial workers were housed in cottages and terraced houses close to the mines and foundries in which they worked. The large influx over the years caused overcrowding which led to outbreaks of Cholera, and on the social and cultural side, the near-loss of the Welsh language in the area. The 1930s inter-war Great