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Longest Riviers of the United Kingdom

Name of watercourse Length Remotest source Mouth
Severn (for 254 km) 354 km (220 mi) Lake on E. side of Plinlimmon, Powys Bristol Channel
Thames (for 178 km) Isis (69 km) - Churn 346 km (215 mi) Seven Springs, Glos North Sea
Trent (for 236 km) - Humber (61 km) 297 km (185 mi) Biddulph Moor, Staffs North Sea (Humber)
Aire (for 126 km) - (Yorkshire)
Ouse (72 km) - Humber (61 km)
259 km (161 mi) NW of North Yorkshire North Sea (Humber)
Ouse
(Great or Bedford)
230 km (143 mi) Nr Brackley, Northants The Wash
Wye (or Gwy) 215 km (135 mi) Plinlimmon, Powys Into Severn S of Chepstow
Tay (for 150 km) - Tummel 188 km (117 mi) (Tay) Beinn Oss (Perthshire and Kinross) North Sea
Nene 161 km (100 mi) Nr Naseby, Northants The Wash
Clyde
(inc. Daer Water)
158 km (98 mi) Nr Earncraig Hill, South Lanarkshire Firth of Clyde (measured to Port Glasgow)
Spey 158 km (98 mi) Loch Spey, Highland North Sea
Tweed 155 km (97 mi) Tweed's Well, Borders North Sea
Dee (Aberdeenshire) 137 km (85 mi) W of Cairn Toul, Aberdeenshire North Sea
Avon (Warwickshire) 137 km (85 mi) Nr Naseby, Northants Into Severn at Tewkesbury
Don (Aberdeenshire) 130 km (81 mi) Carn Cuilchathaidh, Aberdeenshire North Sea
Tees 127 km (79 Mi) Cross Fell, Cumbria North Sea
Bann
(Upper Bann - Lough Neagh - Lower Bann)
122 km (76 mi) Mountains of Mourne Atlantic Ocean
Tyne (for 55 km) - North Tyne (63 km) 119 km (73 mi) Cheviots, between Peel Fell and Carter Fell Northumberland North Sea
Dee (Cheshire) 113 km (70 mi) Bala Lake, Caerarfonshire & Merioneth Irish Sea
Eden 111 km (69 mi) Pennines, SE of Kirkby Stephen, Cumbria Solway Firth, Irish Sea
Usk 105 km (65 mi) Talsarn Mt, Powys Bristol Channel
Wear 105 km (65 mi) W of Wearhead, Northumberland North Sea

 
Lochs and Lakes in Northern Ireland
Name Area
(sq. km)
Area
(sq. mi)
Max. length Max. breadth Max. depth
Lower Neagh 381.7 147.4 28 km
18 mi
17 km
11 mi
31m
102 ft
Lower Lough Erne 105 40.6 28 km
18 mi
8.8 km
5.5 mi
68m
226 ft
 
Lochs and Lakes in Scotland
Name Area
(sq. km)
Area
(sq. mi)
Max. length Max. breadth Max. depth
Loch Lomond 71.2 27.5 36.4 km
22.6 mi
8 km
5 mi
189m
623 ft
Loch Ness 56.6 21.9 36.6 km
22.8 mi
3.2 km
2 mi
228m
751 ft
Loch Awe 38.7 15.0 41 km
25.5 mi
3.2 km
2 mi
93m
307 ft
Loch Maree 28.4 11.0 21.7km
13.5 mi
3.2 km
2 mi
111m
367 ft
Loch Morar 26.6 10.3 18.5km
11.5 mi
2.4 km
1.5 mi
309m
1017 ft
Loch Tay 26.3 10.2 23.4 km
14.6 mi
1.7 km
1.1 mi
154m
508 ft
 
Lochs and Lakes in England
Name Area
(sq. km)
Area
(sq. mi)
Max. length Max. breadth Max. depth
Windermere 14.7 5.7 16.8 km
10.5 mi
1.5 km
0.9 mi
66m
219 ft
Ullswate 8.9 3.4 11.8 km
7.4 mi
1.0 km
0.9 mi
62m
219 ft
Bassenthwaite Water 5.3 2.1 6.1 km
3.8 mi
1.2 km
0.7 mi
21m
70 ft
Derwentwater 5.3 2.1 4.6 km
2.9mi
1.9 km
1.2 mi
21m
72 ft
 

Lochs and Lakes in Wales


Name Area
(sq. km)
Area
(sq. mi)
Max. length Max. breadth Max. depth
Lake Vrywy (dammed) 8.2 3.2 7.5 km
4.7 mi
0.6 km
0.3 mi
36 m
120 ft
Bala Lake (Llyn Tegid) 4.3 1.7 6.1 km
3.8 mi
0.5 km
0.3 mi
38m
125 ft

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