Longest Rivers - Great BritainOnline version Can you name the 10 longest rivers in Great Britain? See how well you know some of the important physical geography of Great Britain! by Summer Sweeting 1 What is the longest river in Great Britain? Written answer 2 The 2nd longest river in Great Britain is: Written answer 3 The third longest river is: Written answer 4 What is the 4th longest river in Great Britain? Written answer 5 The fifth longest river is: Written answer 6 What is the name of the six longest river in Great Britain? Written answer 7 The 7th longest river in Great Britain is: Written answer 8 The 8th longest river in Great Britain is: Written answer 9 the 9th longest river in Britain is called: Written answer 10 What is the tenth longest river in Britain called? Written answer Feedback 1 The Severn is the longest river in Great Britain and runs through Britain. 2 Thames is the 2nd longest river. The Severn River is just longer by 8km! 3 The Third longest river is the Trent, which runs through Nottingham. 4 The fourth longest river is the Ouse, which runs from aroud Bedford to Norfolk 5 Did you get it right? If you did or didn't ,now you know that the Wye is the fifth longest river in Great Britain. 6 The six longest river is the Tay river near Dundee, Scotland. 7 The seventh longest river is the Spey. 8 The Clyde, running near Glasgow is the 8th longest British river. 9 The Nene, a river starting at a bay called The Wash, is the 9th longest river in Great Britain. 10 The 10th and final longest river we will look at is called the Tweed. This river starts in Scotland and just comes across the border into England.