well i think Severn
The River Severn is the mainlands longest river.
severn thames trent
Thames, Severn, Trent, Mersey, Tyne, Clyde, Shannon, Ouse, Avon, Wear. The Thames, Severn, and Tweed are the main rivers in the British Isles. Also, the Shannon River and the Wye River are well-known rivers in the British Isles.
The longest river in Britain is the Severn closely followed by the Thames.
River Severn 220 miles River Thames 215 miles
River Severn River Thames River Trent
No the Severn is the longest, the Thames is the second longest.
The river Severn is slightly longer than the Thames.
The River Severn, River Trent and River Thames.
I suppose it's the Thames, becase it flows through the Capital, London. But the Severn is the longest in England & Wales & the Tay is in Scotland. The longest in the British Isles is the Shannon, wholly in the Republic of ireland.
Shannon Severn Lee Trent Lagan Tyne Corrib Thames Liffey Mersey
no it is not