| Length | Largest city or town | River | % Correct |
|---|---|---|---|
| 346 km | London | River Thames | 99%
|
| 354 km | Bristol | River Severn | 74%
|
| 297 km | Nottingham | River Trent | 57%
|
| 154 km | Rugby | River Avon | 56%
|
| 176 km | Glasgow | River Clyde | 45%
|
| 215 km | Hereford | River Wye | 40%
|
| 140 km | Aberdeen | River Dee | 39%
|
| 230 km | Milton Keynes | River Great Ouse | 37%
|
| 208 km | York | River Ure / River Ouse | 37%
|
| 188 km | Dundee | River Tay | 32%
|
| 155 km | Galashiels | River Tweed | 22%
|
| 172 km | Aviemore | River Spey | 18%
|
| 161 km | Northampton | River Nene | 14%
|
| 145 km | Carlisle | River Eden | 12%
|
| 159 km | Coleraine | River Bann / Lough Neagh | 11%
|