Sinah Common

{{Short description|Site of biological interest in Hampshire, England}}

{{Infobox SSSI

|image= Sinah Common - geograph.org.uk - 1245570.jpg

|image_caption =

|name= Sinah Common

|aos= Hampshire

|interest=Biological

|gridref={{gbmappingsmall|SZ 698 987}}

|area= {{convert|243.0|ha|acre|abbr=off}}

|notifydate= 2000

|map=[https://magic.defra.gov.uk/MagicMap.aspx?startTopic=Designations&activelayer=sssiIndex&query=HYPERLINK%3D%272000412%27 Magic Map]

}}

Sinah Common is a {{convert| 243 |ha|acre|abbr=off|adj=on}} biological Site of Special Scientific Interest on Hayling Island in Hampshire, England.{{cite web|url= https://designatedsites.naturalengland.org.uk/SiteDetail.aspx?SiteCode=S2000412&SiteName=&countyCode=19&responsiblePerson=&SeaArea=&IFCAArea= |title=Designated Sites View: Sinah Common | series= Sites of Special Scientific Interest|publisher=Natural England|accessdate = 19 May 2020}}{{cite web|url= https://magic.defra.gov.uk/MagicMap.aspx?startTopic=Designations&activelayer=sssiIndex&query=HYPERLINK%3D%272000412%27|title=Map of Sinah Common|series= Sites of Special Scientific Interest|publisher=Natural England|accessdate= 19 May 2020}}

This coastal site has maritime shingle grassland, some of which is rich in lichens, sand dunes, heath and saltmarsh. It has also been designated an SSSI because of its population of the endangered flowering plant childing pink at one of only two sites in Britain, and for its outstanding assemblage of other nationally scarce plants. There are also populations of nationally rare and scarce invertebrates.{{cite web|url= https://designatedsites.naturalengland.org.uk/PDFsForWeb/Citation/2000412.pdf |title=Sinah Common citation|series= Sites of Special Scientific Interest|publisher=Natural England|accessdate= 19 May 2020}}

It lies adjacent to the Sinah Common World War II Heavy Anti-aircraft gunsite, a scheduled monument, with a small overlap.{{cite web|url=https://historicengland.org.uk/listing/the-list/list-entry/1020961?section=official-list-entry|title=World War II Heavy Anti-aircraft gunsite (P2) at Sinah Common, 570m south east of Sinah Farm |work=National Heritage List for England|publisher=Historic England|access-date=28 November 2023}}