Editing River Severn (section)

==Severn bore==
{{Main|Severn bore}}
[[Image:SevernBore1994.jpg|thumb|left|Bore hitting the riverbank in 1994]]
A phenomenon associated with the lower reaches of the Severn is the [[tidal bore]],<ref name="Rowbotham, Severn Bore" /> which forms upstream of the port of [[Sharpness, Gloucestershire|Sharpness]].

It is frequently asserted that the river's [[estuary]], which empties into the [[Bristol Channel]], has the second largest [[tidal range]] in the world—{{convert|48|ft|m|0}},<ref>{{cite web
  | url= http://www.environment-agency.gov.uk/research/library/position/99429.aspx
  | archive-url= http://webarchive.nationalarchives.gov.uk/20090205000049/http://www.environment-agency.gov.uk/research/library/position/99429.aspx
  | url-status= dead
  | archive-date= 5 February 2009
  | publisher=UK [[Environment Agency]]
  | title= About the Severn Estuary
  | date= 5 March 2006 | access-date= 13 March 2010
}}</ref><ref>{{cite web
  | url= http://www.bbc.co.uk/bristol/content/articles/2005/07/04/bristolchannel_feature.shtml
  | title= Coast: Bristol Channel
  | publisher= BBC
  | access-date= 27 August 2007
  | archive-date= 25 May 2006
  | archive-url= https://web.archive.org/web/20060525130200/http://www.bbc.co.uk/bristol/content/articles/2005/07/04/bristolchannel_feature.shtml
  | url-status= live
  }}</ref> exceeded only by the [[Bay of Fundy]]. However a tidal range greater than that of the Severn is recorded from the lesser known [[Ungava Bay]] in Canada.<ref>{{cite web |url=http://www.co-ops.nos.noaa.gov/faq2.html#26 |title=Frequently Asked Questions – Tide Predictions and Data |publisher=Co-ops.nos.noaa.gov |access-date=28 May 2013 |archive-date=18 March 2021 |archive-url=https://web.archive.org/web/20210318001320/https://co-ops.nos.noaa.gov/faq2.html#26 |url-status=live }}</ref> During the highest tides, the rising water is funnelled up the Severn estuary into a wave that travels rapidly upstream against the river current. The largest bores occur in spring, but smaller ones can be seen throughout the year. The bore is accompanied by a rapid rise in water level which continues for about one and a half hours after the bore has passed.