The Malvern Hills divide Herefordshire from Worcestershire. Britain's longest river, the Severn runs through the county, as does the River Wye and the 30-mile Worcester to Birmingham Canal, built to facilitate the areas porcelain trade. Hereford and Worcesters rural landscape, fishing and fresh air have attracted visitors ever since the Roman occupation of Britain. Popular attractions in the area are the Black Mountains along the Welsh border, the Malvern Hills (from the Celtic Moel-bryn meaning Bare-Hill) and the Wye Forest. The famous porcelain-making city of Worcester is the modern county administrative centre and it has a cathedral, Guildhall, Royal Porcelain Museum and factory, and the Civil War Centre.