a river which rises near Plimlimmon-Hill in Montgomeryshire, and before it enters Shropshire receives about 30 streams, and passes down to Ludlow, where it receives the Morda, that flows from Olsworthy. When it arrives at Monford, it receives the river Mon, passing on to Shrewsbury, which it almost surrounds, then to Bridgeworth; afterwards it runs through the skirts of Staffordshire, enters Worcestercshire, and passes by Worcester; then it runs to English Gaunt, Tewkesbury, where it joins the Avon, and from thence to Gloucester, keeping a north-westerly course, till it falls into the Bristol Channel. It begins to be navigable for boats at Welchpool, in Montgomeryshire, and takes in several other rivers in its course, besides those already mentioned, and is the second in England. By the late inland navigation, it has communication with the rivers Mersey, Dee, Ribble, Ouse, Trent, Derwent, Humber, Thames, Avon, &c., which navigation, including its windings, extends above 500 miles in the counties of Lincoln, Nottingham, York, Lancaster, Westmorland, Chester, Stafford, Warwick, Leicestershire, Oxford, Worcestershire, &c. A canal from Stroud-Water, a branch of the Severn, to join the Thames, has lately been undertaken, by which great undertaking of conveying a tunnel 16 feet high and 16 feet wide, under Sapperton Hill and Hayley-Wood (very high ground), for two miles and a quarter in length, through a very hard rock, lined and arched with brick, is entirely completed, and boats passed through it the 21st of May 1789. By this opening, a communication is made between the river Severn at Severus. Framiload and the Thames near Lechlade, and will be continued over the Thames near Inglesham, into deep water in the Thames below St John-Bridge, and so to Oxford, &c. and London, for conveyance of coals, goods, &c. It is now navigable from the Severn to Themsford, by way of Stroud, Cirencester, Cricklade, &c. being filled with water for that purpose near 40 miles.