Longest rivers of the United Kingdom

River Length
(miles)		 (km) Constituent Country
1 River Severn[1] 220 354 England/Wales
2 River Thames[1] 215 346 England
3 River Trent[1] 185 297 England
4 River Great Ouse[1] 143 230 England
5 River Wye[1] 135 215 England/Wales
6 River Ure/River Ouse, Yorkshire 129 208 England
7 River Tay[1] 117 188 Scotland
8 River Spey 107 172 Scotland
9 River Clyde 106 172 Scotland
10 River Nene[1] 100 161 England
11 River Tweed[1] 96 155 England/Scotland
12 River Avon, Warwickshire 96 154 England
13 River Eden, Cumbria 90 145 England
14 River Dee, Aberdeenshire 87 140 Scotland
15 River Witham 82 132 England
16 River Teme 81 130 England/Wales
17 River Don, Aberdeenshire[1] 80 129 Scotland
18 River Bann 76 122 Northern Ireland
=19 River Ribble 75 120 England
=19 River Avon, Bristol 75 120 England
21 River Tyne[1] 73 118 England
22 River Derwent, Yorkshire 72 115 England
=23 River Aire 71 114 England
=23 River Nith 71 114 Scotland
=25 River Tees 70 113 England
=25 River Medway 70 113 England
=25 River Mersey 70 113 England
=28 River Dee, Wales[1] 70 112 England/Wales
=28 River Don, South Yorkshire 70 112 England

There seems to be little consensus as to the lengths of rivers in published sources, nor much agreement as to what constitutes a river. Thus the River Ure / River Ouse can be counted as one river system or two rivers. If it is counted as one, the River Aire / Yorkshire Ouse / Humber system would come fourth in the list, with a combined length of 161 miles (259 km). Also, the Thames tributary, the River Churn, sourced at Seven Springs adds 14 miles to the length of the Thames (from its traditional source at Thames head). The Churn/Thames' length at 229 mi (369 km) is therefore greater than the Severn’s length - 220 mi (354 km). Thus, the combined Churn/Thames river would top the list. Sue Owen et. al. in their book on Rivers generally restrict the length to the parts that bear the correct name. Thus the River Nene is quoted at 100 miles (160 km), but would be around 5 miles (8.0 km) more if the variously named sources were included. Many of the above lengths are considerably different to Owen's list, some longer and some shorter.[1]

See also

References

  1. ^ a b c d e f g h i j k l Rivers and the British Landscape, (2005), Sue Owen et al., Carnegie Publishing, ISBN 978-1-85936-120-7
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