Upper Arun

{{Use dmy dates|date=April 2022}}

{{Infobox SSSI

|image= Arun journey - geograph.org.uk - 804383.jpg

|image_caption =

|name= Upper Arun

|aos= West Sussex

|interest=Biological

|gridref={{gbmappingsmall|TQ 044 220}}

|area= {{convert|17.6|ha|acre|abbr=off}}

|notifydate= 1988

|map=[https://magic.defra.gov.uk/MagicMap.aspx?startTopic=Designations&activelayer=sssiIndex&query=HYPERLINK%3D%271000768%27 Magic Map]

}}

Upper Arun is a {{convert| 17.6 |ha|acre|abbr=off|adj=on}} biological Site of Special Scientific Interest between Billingshurst and Pulborough in West Sussex.{{cite web|url= https://designatedsites.naturalengland.org.uk/SiteDetail.aspx?SiteCode=S1000768&SiteName=&countyCode=46&responsiblePerson=&SeaArea=&IFCAArea= |title=Designated Sites View: Upper Arun | series= Sites of Special Scientific Interest|publisher=Natural England|access-date = 22 May 2019}}{{cite web|url= https://magic.defra.gov.uk/MagicMap.aspx?startTopic=Designations&activelayer=sssiIndex&query=HYPERLINK%3D%271000768%27|title=Map of Upper Arun|series= Sites of Special Scientific Interest|publisher=Natural England|access-date= 22 May 2019}}

This {{convert| 13|km|mi|abbr=off|0|adj=on}} long stretch of the River Arun provides the habitat for a rich riverine flora, such as common club-rush and reed canary-grass. It is an outstanding site for breeding dragonflies, including the clubtail, hairy, brilliant emerald and the nationally rare scarce chaser.{{cite web|url= https://designatedsites.naturalengland.org.uk/PDFsForWeb/Citation/1000768.pdf |title=Upper Arun citation|series= Sites of Special Scientific Interest|publisher=Natural England|access-date= 22 May 2019}}