Editing Isleworth (section)

==Geography==
Elevations range from {{cvt|27|m|ft}} in the northwest to {{cvt|4.9|m|ft}} by the Thames at the opposite extreme [[Ordnance Datum|OD]]. The boundaries are longstanding, subject to twentieth-century western and southern circonscriptions: Isleworth is east of the town of [[Hounslow]] which has more retail and offices, in the [[London Borough of Hounslow|borough of that name]]; west of the [[River Thames]]; north of its tributary and the northern confluence of the [[River Crane, London|Crane]] (before 1998 its southern channel); and south of the [[drainage divide|crest]] by the [[M4 motorway (Great Britain)|M4 motorway]] separating the Brent and Crane catchments.<ref>{{cite web |url= http://lwt.elmbrook.eu/NatureReserves/IsleworthAit/tabid/136/Default.aspx |title= Isleworth Ait |year= 2007 |publisher= London Wildlife Trust |access-date= 26 December 2010 |url-status= dead |archive-url= https://web.archive.org/web/20080408151140/http://lwt.elmbrook.eu/Naturereserves/IsleworthAit/tabid/136/Default.aspx |archive-date= 8 April 2008 |df= dmy-all }}</ref>  Half of the River Crane flows into the Thames south of the Ait, and its [[distributary]] the [[Duke of Northumberland's River]] flows toward its midpoint from the west.