Can you identify these rivers which flow through England (Eng), Wales (Wal), Scotland (Sco) or Northern Ireland (NI). They all have a length greater than 20 miles (32km) though length is subjective and depends on what is generally accepted as the source.
Some rivers in Northern Ireland cross the border into the Republic of Ireland (Ire) and are included here.
Some rivers have different names along different parts of their length. In these cases, any of the names will be accepted.
The list is as comprehensive as possible but there may be some exceptions where the length or exact route of a 'named' river is uncertain.
I enjoyed it even though I did abysmally! You could, if you wanted, also include the Darent right at the bottom of the list - not that I thought of it till after pressing "give up".