A flourishing and progressive seaport of Glamorganshire, at the entrance of the Tawe, 45 m. into Swansea Bay; has a splendid harbour, 60 acres of docks, a castle, old grammar-school, &c.; is the chief seat of the copper-smelting and of the tin-plate manufacture of England, and exports the products of these works, as well as coal, zinc, and other minerals, in large quantities.