Following the development of the coal found in the Cynon Valley, Rhondda Valley, and Merthyr areas of South Wales, the export of both coal and iron products required a sea connection to the Bristol Channel if economic volumes of product were to be extracted.

In 1794, the Glamorganshire Canal was completed, linking the then small town of Cardiff with Merthyr, and in 1798 a basin was built, connecting the canal to the sea.
By the 1830s, Cardiff became the pre-eminent iron-exporting port, shipping almost half of British overseas iron exports; between 1840 and 1870, the volume of coal exports increased from 44,350 to 2.219 million tonnes.
Following the development of the coal found in the Cynon Valley, Rhondda Valley, and Merthyr areas of South Wales, the export of both coal and iron products required a sea connection to the Bristol Channel if economic volumes of product were to be extracted.
In 1794, the Glamorganshire Canal was completed, linking the then small town of Cardiff with Merthyr, and in 1798 a basin was built, connecting the canal to the sea. By the 1830s, Cardiff became the pre-eminent iron-exporting port, shipping almost half of British overseas iron exports; between 1840 and 1870, the volume of coal exports increased from 44,350 to 2.219 million tonnes.
Cardiff Docks