List_of_the_largest_Sites_of_Special_Scientific_Interest_in_England

List of the largest Sites of Special Scientific Interest in England

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This is a list of the largest Sites of Special Scientific Interest in England in decreasing order of size. A lower threshold of 100 hectares or one square kilometre has been used.

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Site name	Area of Search	Reason for designation		Area^{[ a]}		Grid reference	Year in which notified	Map^[B]
Site name	Area of Search	Biological interest	Geological interest	Hectares	Acres	Grid reference	Year in which notified	Map^[B]
The Wash	Norfolk / Lincolnshire	Y		63,135.0	156,010.0	TF550400	1972
North York Moors	North Yorkshire / Cleveland	Y		44,087.7	108,943.1	NZ680000	1998
Humber Estuary	East Riding of Yorkshire / Lincolnshire	Y	Y	37,000.6	91,430.5	TA216184	2004
Dark Peak	Derbyshire / Greater Manchester / South Yorkshire / West Yorkshire	Y	Y	31,852.9	78,710.2	SK110960	1951
Morecambe Bay	Cumbria / Lancashire	Y		30,287.5	74,842.0	SD360700	1975
Upper Solway Flats and Marshes	Cumbria / ?	Y	Y	29,950.5	74,009.3	NY160610	1988
The New Forest	Hampshire / Wiltshire	Y	Y	28,947.4	71,530.6	SU298081	1959	Map
South Pennine Moors	West Yorkshire / Great Manchester / Lancashire / North Yorkshire	Y	Y	20,938.1	51,739.2	SD920300	1994
Salisbury Plain	Wiltshire / Hampshire	Y		19,689.9	48,654.8	SU070500	1975	Map
Breckland Forest	Norfolk / Suffolk	Y	Y	18,078.7	44,673.4	TL819839	2000
Severn Estuary	Avon / Somerset + others	Y	Y	15,950.0	39,413.3	ST480830	1976
Upper Teesdale	County Durham	Y	Y	14,035.6	34,682.7	NY830320	1951
Moorhouse and Cross Fell	Cumbria / County Durham	Y	Y	13,707.0	33,870.7	NY715365	1990
Dee Estuary	Cheshire / Clwyd	Y		13,679.7	33,803.3	SJ220800	1954
Breckland Farmland	Norfolk / Suffolk	Y		13,335.7	32,953.2	TL762783	2000
North Dartmoor	Devon	Y	Y	13,413.2	33,144.7	SX580850	1952
North Exmoor	Devon / Somerset	Y	Y	12,005.3	29,665.7	SS800430	1954

Site name	Area of Search	Reason for designation		Area^{[ a]}		Grid reference	Year in which notified	Map^[B]
Site name	Area of Search	Biological interest	Geological interest	Hectares	Acres	Grid reference	Year in which notified	Map^[B]
South Dartmoor	Devon	Y	Y	9,668.2	23,890.6	SX630690	1952
Hexhamshire Moors	County Durham / Northumberland	Y		9,433.9	23,311.7	NY870530	1998	Map
Kielderhead and Emblehope Moors	Northumberland	Y		8,254.4	20,397.1	NT700000	1971
Eastern Peak District Moors	South Yorkshire / ?	Y	Y	8,094.4	20,001.7	SK270770	1955	Map
Bollihope, Pikestone, Eggleston and Woodland Fells	County Durham	Y		7,949.2	19,642.9	NZ005300	1996	Map
North Norfolk Coast	Norfolk	Y	Y	7,700.0	19,027.1	TG020440	1954
Duddon Estuary	Cumbria	Y	Y	6,806.3	16,818.7	SD151753	1990 (amalgamated 5)	Map
Mersey Estuary	Cheshire / Merseyside	Y		6,702.1	16,561.2	SJ440800	1951
The Swale	Kent	Y	Y	6,568.4	16,230.9	TR000670	1968
Blackwater Estuary	Essex	Y	Y	5,738.0	14,178.9	TL940070	1955
South Thames Estuary and Marshes	Kent	Y		5,449.1	13,465.0	TQ770785	1951
Bodmin Moor, North	Cornwall	Y		4,957.0	12,249.0	SX160810	1951
Kielder Mires	Cumbria / Northumberland	Y		4,818.0	11,905.5	NY670800	1995
Bowes Moor	County Durham	Y		4,457.7	11,015.2	NY923104	1989	Map
Poole Harbour	Dorset	Y		4,049.0	10,005.3	SZ000890	1964

Site name	Area of Search	Reason for designation		Area^{[ a]}		Grid reference	Year in which notified	Map^[B]
Site name	Area of Search	Biological interest	Geological interest	Hectares	Acres	Grid reference	Year in which notified	Map^[B]
Chichester Harbour	Hampshire / West Sussex	Y	Y	3,695.0	9,130.5	SU760000	1970
Bridgwater Bay	Somerset	Y		3,574.1	8,831.8	ST290480	1989
Dungeness	East Sussex / Kent	Y	Y	3,241.7	8,010.4	TR050180	1951
Ashdown Forest	East Sussex	Y		3,144.6	7,770.5	TQ450300	1953
South Exmoor	Devon / Somerset	Y		3,132.7	7,741.1	SS880340	1992
Long Mynd	Shropshire	Y	Y	2,637.6	6,517.7	SO420950	1953
Alde-Ore Estuary	Suffolk	Y		2,554.3	6,311.8	TM394757	1952
The Quantocks	Somerset	Y		2,506.9	6,194.7	ST140390	1970	Map
Ouse Washes	Cambridgeshire / Norfolk	Y		2,403.0	5,937.9	TL482867	1955
Exe Estuary	Devon	Y	Y	2,186.6	5,403.2	SX980845	1952
East Dartmoor	Devon	Y	Y	2,088.1	5,159.8	SX695815	1976
Langstone Harbour	Hampshire	Y		2,069.4	5,113.6	SU700030	1958

Site name	Area of Search	Reason for designation		Area^{[ a]}		Grid reference	Year in which notified	Map^[B]
Site name	Area of Search	Biological interest	Geological interest	Hectares	Acres	Grid reference	Year in which notified	Map^[B]
Thorne Crowle and Goole Moors	East Riding / South Yorkshire	Y		1,918.6	4,741.0	SE730160	1970
Windsor Forest and Great Park	Berkshire / Surrey	Y		1,771.2	4,376.7	SU970685	1973
Exmoor Coastal Heaths	Somerset	Y		1,758.3	4,344.9	SS620480	1994	Map
Wyre Forest	Shropshire / Hereford & Worcester	Y		1,753.7	4,333.5	SS750760	1955
Epping Forest	Essex / Greater London	Y		1,728.0	4,270.0	TL475035	1953
Porton Down	Wiltshire	Y		1,561.8	3,859.3	SU240365	1977	Map
Rutland Water	Leicestershire	Y		1,540.1	3,805.7	SK928070	1981

Site name	Area of Search	Reason for designation		Area^{[ a]}		Grid reference	Year in which notified	Map^[B]
Site name	Area of Search	Biological interest	Geological interest	Hectares	Acres	Grid reference	Year in which notified	Map^[B]
Upper Severn Estuary	Gloucestershire	Y		1,436.8	3,550.4	SO720060	1954	Map
Tamar - Tavy Estuary	Cornwall / Devon	Y		1,422.3	3,514.6	SX474650	1991
Hatfield Moors	South Yorkshire	Y		1,400.7	3,461.2	SE705060	1954
Avon Valley (Bickton to Christchurch)	Dorset / Hampshire	Y		1,383.7	3,419.2	TU147123	1974
Braunton Burrows	Devon	Y	Y	1,356.7	3,352.5	SS430350	1952
Taw-Torridge Estuary	Devon	Y		1,336.5	3,302.6	SS470310	1981
Nene Washes	Cambridgeshire	Y		1,310.0	3,237.1	TL200977	1959
Portsmouth Harbour	Hampshire	Y		1,266.1	3,128.6	SU620035	1974
East Devon Pebblebed Heaths	Devon	Y		1,111.9	2,747.6	SY050880	1952
Catcott, Edington and Chilton Moors	Somerset	Y		1,083.0	2,676.2	ST390420	1967	Map
West Sedgemoor	Somerset	Y		1,016.0	2,510.6	ST361258	1983	Map
Haldon Forest	Devon	Y		1,013.2	2,503.7	SX886838	1992	Map

List_of_the_largest_Sites_of_Special_Scientific_Interest_in_England

List of the largest Sites of Special Scientific Interest in England

Sites more than 10,000 hectares in size

Sites more than 4000 hectares in size

Sites more than 2000 hectares in size

Sites more than 1500 hectares in size

Sites more than 1000 hectares in size

Sites more than 750 hectares in size

Sites more than 500 hectares in size

Sites more than 400 hectares in size

Sites more than 300 hectares in size

Sites more than 250 hectares in size

Sites more than 200 hectares in size

Sites more than 150 hectares in size

Sites more than 100 hectares in size

Notes

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Site name	Area of Search	Reason for designation		Area^{[ a]}		Grid reference	Year in which notified	Map^[B]
Site name	Area of Search	Biological interest	Geological interest	Hectares	Acres	Grid reference	Year in which notified	Map^[B]
Church Wood, Blean	Kent	Y		297.1	734.2	TR109603	1951
Seal Sands	Cleveland	Y		294.4	727.5	NZ529260	1966
Lower Woods	Avon	Y	Y	280.1	692.1	ST743876	1966
Greenham and Crookham Commons	Berkshire	Y		278.6	688.4	SU490645 & SU523643	1985
Lower Fal & Helford Intertidal	Cornwall	Y		277.7	686.2	SW860334	1997
Tees and Hartlepool Foreshore and Wetlands	Cleveland	Y		255.6	631.6	NZ516348 & NZ505224	1997
Skipwith Common	North Yorkshire	Y		274	677.1	SE668362	1958
Slapton Ley	Devon	Y	Y	254.7	629.4	SX826440	2004

Site name	Area of Search	Reason for designation		Area^{[ a]}		Grid reference	Year in which notified	Map^[B]
Site name	Area of Search	Biological interest	Geological interest	Hectares	Acres	Grid reference	Year in which notified	Map^[B]
Attenborough Nature Reserve	Nottinghamshire	Y		226.6	559.9	SK514338	1982	Map
Asham Wood	Somerset	Y		141.6	349.9	ST705460	1963
Burrington Combe	Avon / North Somerset	Y	Y	139.1	343.7	ST478583	1952
Wenlock Edge	Shropshire	Y	Y	136.8	338.0	SO606995	1954
Tickenham, Nailsea and Kenn Moors	Avon	Y		129.4	319.8	ST440700	1995
Bowerchalke Downs	Wiltshire	Y		128.6	317.8	SU004218	1971	Map
Calstone And Cherhill Downs	Wiltshire	Y		128.6	317.8	SU047692	1971	Map
King's Wood and Urchin Wood	Avon	Y		128.1	316.5	ST454645	1990
East Polden Grasslands	Somerset	Y		124.0	306.4	ST474325	1999	Map
Upper Fowey Valley	Cornwall	Y		124.0	306.4	SX215730	1989
Potteric Carr	South Yorkshire	Y		119.6	295.5	SE599003	1977
Cowpen Marsh	Cleveland	Y		116.8	288.6	NZ500529	1966
River Kennet	Berkshire / Wiltshire	Y		112.7	278.5	SU203692	1995	Map
Cheddar Reservoir	Somerset	Y		105.4	260.4	ST441537	1972	Map
River Barle	Somerset	Y		104.2	257.5	SS723423	1997	Map
Dozmary Pool	Cornwall	Y	Y	104.2	257.5	SX195745	1986
Prior's Park & Adcombe Wood	Somerset	Y		103.6	256.0	ST225170	1952	Map