Editing River Severn (section)

==Severn Estuary==
{{Main|Severn Estuary}}
[[File:Severn Aerial.jpg|thumb|left|The [[Severn crossing|Severn bridges]] crossing near the mouth of the '''River Severn''']]
The river becomes tidal close to [[Maisemore]], on the West Channel just north of Gloucester, and at Llanthony Weir on the East Channel. However, particularly high tides may overtop the weir at [[Tewkesbury]], and even the foot of the weir at [[Worcester, England|Worcester]] may experience a rise in water level of {{convert|1|ft|cm}} or so.<ref name="Rowbotham, Severn Bore">{{cite book |last=Rowbotham |first=Fred |title=Severn Bore |isbn=0-7153-8508-9 |publisher=[[David & Charles]] |year=1983 |orig-year=1964}}</ref>{{rp|19–26}}

The [[tidal river]] downstream from Gloucester is sometimes referred to as the Severn Estuary, but the river is usually considered to become the Severn Estuary after the [[Second Severn Crossing]] near [[Severn Beach]], [[South Gloucestershire]] (the point to which the jurisdiction of the [[Gloucester Harbour Trustees]] extends), or at [[Aust]], the site of the [[Severn Bridge]].

The Severn Estuary extends to a line from [[Lavernock Point]] (south of [[Cardiff]]) to [[Sand Point, Somerset|Sand Point]] near [[Weston-super-Mare]]. West of this line is the [[Bristol Channel]]. In the Severn Estuary (or the [[Bristol Channel]] in the last two cases, depending where the boundary is drawn) are the rocky islands called [[Denny Island]], [[Steep Holm]] and [[Flat Holm]].

The estuary is about {{convert|2|mi|km|0}} wide at Aust, and about {{convert|9|mi|km|0}} wide between Cardiff and Weston-super-Mare.