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There seems to be little consensus as to the lengths of rivers in published sources, nor much agreement as to what constitutes a river. Thus the River Ure / River Ouse can be counted as one river system or two rivers. If it is counted as one, the River Aire / Yorkshire Ouse / Humber system would come fourth in the list, with a combined length of and indeed, the River Trent / Humber system would top the list with their combined length of 222 mi (357 km).〔http://copranet.projects.eucc-d.de/files/000165_EUROSION_Humber_Estuary.pdf〕 Also, the Thames tributary, the River Churn, sourced at ''Seven Springs'' adds 14 miles to the length of the Thames (from its traditional source at Thames head). The Churn/Thames' length at 229 mi (369 km) is therefore greater than the Severn’s length - 220 mi (354 km). Thus, the combined ''Churn/Thames'' river would top the list. Sue Owen et al. in their book on Rivers generally restrict the length to the parts that bear the correct name. Thus the River Nene is quoted at , but would be around more if the variously named sources were included. Many of the above lengths are considerably different from Steve Owen's list, some longer and some shorter.〔 Where a river ends in an estuary the conventional British approach has been to use the end of the administrative zone. Thus the Severn ends at the mouth of the Bristol Avon and the Thames to the Yantlet Line. The currently accepted end of the Severn Estuary is nearly about further and the PLA's authority stretches now to Margate, further. Other countries have different conventions, making comparisons of limited value. ==See also== * List of rivers of England * Northern Ireland * List of rivers of Scotland * List of rivers of Wales * List of rivers in the Isle of Man * Terminology * * Estuary * * Firth * * Floodplain * * River * * River delta * * Source (river or stream) * * Tributary * * British Waterways (Waterscape) * * Canals of the United Kingdom * * Geography of the United Kingdom * * List of lakes in the United Kingdom * * Reservoirs and dams in the United Kingdom * * Waterfalls of the United Kingdom * * Waterways in the United Kingdom 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Longest rivers of the United Kingdom」の詳細全文を読む スポンサード リンク
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