What is the river longest in UK?

Answer 1

The longest river in the United Kingdom is the River Severn, which is 354 km (220 miles) long. It runs through England and Wales.

The Longest river in the British Isles is the River Shannon in Ireland at 386 km (240 miles).

Answer 2

The River Severn - but only by 3 miles. The River Thames is second longest.

Answer 3

The River Severn - which is about 3 miles longer than the River Thames.

Answer 4

Severn