River Severn is in Severn Estuary.
The River Severn rises on Plynlimon after which it passes Llanidloes, Caersws, Welshpool, Crew Green, Shrawardine, Shrewsbury, Wroxeter, Bridgnorth, Bewdley, Stourport-on-Severn, Worcester, Tewkesbury, Gloucester becoming the Severn Estuary around Thornwell.
The River Stour Worcestershire rises in the Clent Hills and near Romsley after which it passes Halesowen, Cradley, Stourbridge, Stourton, Cookley, Wolverley and Kidderminster before joining the River Severn at Stourport-on-Severn.
The River Teme rises around three miles south of Dolfor in Powys. For much of its upper course it forms the border between England and Wales after which it passes through Leintwardine, Bromfield, Ludlow, Tenbury Wells, Stanford Bridge, Shelsey Beauchamp, Leigh and Bransford after which it joins the River Severn around 3 km south of Worcester.
Works of Gildas Chapter 2 The History. 3. The island of Britain, situated on almost the utmost border of the earth, towards the south and west, and poised in the Divine balance, as is said, which supports the whole world, stretches out from the southwest towards the North Pole, and is eight hundred miles long and two hundred broad, except where the headlands of sundry promontories stretch farther into the sea. It is surrounded by the ocean, which forms winding bays, and is strongly defended by this ample and, if I may so call it, impassable barrier, save on the south side, where the narrow sea affords a passage to Belgic Gaul. It is enriched by the mouths of two noble rivers, the Thames and the Severn, as it were two arms, by which foreign luxuries were of old imported, and by other streams of less importance. It is famous for eightand-twenty cities, and is embellished by certain castles, with walls, towers, well-barred gates, and houses with threatening battlements built on high, and provided with all requisite instruments of defence. Its plains are spacious, its hills are pleasantly situated, adapted for superior tillage, and its mountains are admirably calculated for the alternate pasturage of cattle, where flowers of various colours, trodden by the feet of man, give it the appearance of a lovely picture. It is decked, like a man’s chosen bride, with divers jewels, with lucid fountains, and abundant brooks wandering over the snowwhite sands; with transparent rivers, flowing in gentle murmurs, and offering a pledge of sweet slumber to those who recline upon their banks, whilst it is irrigated by abundant lakes, which pour forth cool torrents of refreshing water.