mini|Severn Bridges nær munningen til elva Severn. mini|Themsen i London. Dette er ei liste over dei lengste elvane i Storbritannia. <tr><th> <th>Elv<th>Lengd (km) <tr><td>1<td>SevernRivers and the British Landscape, (2005), Sue Owen et al., Carnegie Publishing, ISBN 978-1-85936-120-7<td>354 <tr><td>2<td>Themsen<td>346 <tr><td>3<td>Trent<td>297 <tr><td>4<td>Great Ouse<td>230 <tr><td>5<td>Wye<td>215 <tr><td>6<td>Ure/Ouse i Yorkshire<td>208 <tr><td>7<td>Tay<td>188 <tr><td>8<td>Spey<td>172 <tr><td>9<td>Clyde<td>172 <tr><td>10<td>Nene<td>161 <tr><td>11<td>Tweed<td>155 <tr><td>12<td>Avon i Warwickshire<td>154 <tr><td>13<td>Eden i Cumbria<td>145 <tr><td>14<td>Dee i Aberdeenshire<td>140 <tr><td>15<td>Witham<td>132 <tr><td>16<td>Teme<td>130 <tr><td>17<td>Don i Aberdeenshire<td>129 <tr><td>18<td>Bann<td>122 <tr><td>=19<td>Ribble<td>120 <tr><td>=19<td>Avon i Bristol<td>120 <tr><td>21<td>Tyne<td>118 <tr><td>22<td>Derwent i Yorkshire<td>115 <tr><td>=23<td>Aire<td>114 <tr><td>=23<td>Nith<td>114 <tr><td>=25<td>Tees<td>113 <tr><td>=25<td>Medway<td>113 <tr><td>=25<td>Mersey<td>113 <tr><td>=28<td>Dee i Wales<td>112 <tr><td>=28<td>Don i South Yorkshire<td>112
Kjelder Denne artikkelen bygger på «Longest rivers of the United Kingdom» frå , den 3. juli 2011. oppgav desse kjeldene: