List of Sites of Special Scientific Interest in Hertfordshire

A map of Hertfordshire, and its location within England also shown

This is a list of the Sites of Special Scientific Interest (SSSIs) in Hertfordshire, a county in the East of England region. In terms of size, the region extends from Norfolk, in the north, to the Thames estuary, in the extreme south,^[1] and almost two-thirds of the county is rural.^[2] Hertfordshire itself, however, has a population of 1,058,600 within an area of 1,634 km² (403,770.2 acres), making it the 16th largest ceremonial county in the United Kingdom.^[3] As of 2008^[update], there are 43 sites designated within this Area of Search, 28 of which have been designated for their biological interest, six for their geological interest, and nine for both biological and geological interest.^[4] In England, the body responsible for designating SSSIs is Natural England, which chooses sites because of their flora, fauna, geological or physiographical features.^[5] Natural England took over the role of designating and managing SSSIs from English Nature in October 2006 when it was formed from the amalgamation of English Nature, parts of the Countryside Agency and the Rural Development Service. The data in the table is taken from English Nature's website in the form of citation sheets for each SSSI.^[6]

Sites

Site name	Reason for designation		Area[A]		Grid reference[B][C]	Year in which notified[D]	Map[E]
	Biological interest	Geological interest	Hectares	Acres
Aldbury Nowers	Y		19.7	48.7	SP951135	1990	1
Alpine Meadow	Y		0.4	1.0	SP989103	1986	2
Amwell Quarry	Y		39.96	91.33	TL377129	1999	3
Ashridge Commons & Woods	Y		640.1	1581.7	SP975135	1987	4
Ashwell Springs	Y		0.3	0.6	TL270398	1986	5
Benington High Wood	Y		20.7	57.1	TL285235	1984	6
Blagrove Common	Y		4.0	9.9	TL326338	1985	7
Bricket Wood Common	Y		70.0	172.4	TL130010	1984	8
Castle Lime Works Quarry		Y	1.6	3.9	TL229026	1986	9
Croxley Common Moor	Y		39.5	97.6	TQ083949	1986	10
Downfield Pit, Westmill		Y	3.6	8.9	TL349165	1989	11
Frogmore Meadows	Y		4.6	11.4	TQ021989	1986	12
Great Hormead Park	Y		15.0	37.1	TL418292	1985	13
Hertford Heath	Y		28.0	69.2	TL355110 and TL350106	1985	14
Hillcollins Pit		Y	0.2	0.5	TL442268	1988	15
Hunsdon Mead	Y		34.0	84.0	TL418110	1984	16
Knebworth Woods	Y		120.8	298.5	TL228223	1985	17
Little Heath Pit		Y	0.3	0.7	TL017082	1986	18
Moor Hall Meadows	Y		24.4	60.3	TL330265	1986	19
Moor Mill Quarry, West		Y	0.16	0.4	TL141027	1992	20
Northaw Great Wood	Y		223.6	552.6	TL280043	1985	21
Oddy Hill and Tring Park	Y		35.6	87.8	SP934109 and SP928103	1986	22
Oughtonhead Lane	Y	Y	0.9	2.2	TL172299	1989	23
Patmore Heath	Y		7.6	18.8	TL443258	1985	24
Plashes Wood	Y		71.9	117.6	TL382206	1984	25
Redwell Wood	Y		52.8	130.4	TL213025	1985	26
Roughdown Common	Y	Y	3.6	8.9	TL047577	1985	27
Rye Meads	Y		58.5	114.5	TL385105	1989	28
Sarratt Bottom	Y		3.2	7.9	TQ031989	1984	29
Sawbridgeworth Marsh	Y		6.3	15.5	TL492158	1986	30
Sherrardspark Wood	Y	Y	74.9	185.1	TL230139	1986	31
Tewinbury	Y		7.5	18.5	TL264139	1984	32
Therfield Heath	Y		143.33	354.14	TL335400	1984	33
Thorley Flood Pound	Y		17.4	42.7	TL490183	1986	34
Tring Reservoirs	Y	Y	106.5	263.2	SP919136 and SP905131	1987	35
Tring Woodlands	Y		23.8	58.8	SP917100	1985	36
Turnford & Cheshunt Pits	Y	Y	173.28	428.17	TL370030	1995	37
Wain Wood	Y		19.2	47.4	TL180255	1986	38
Water End Swallow Holes	Y	Y	11.3	27.9	TL230043	1986	39
Westwood Quarry		Y	0.07	0.18	TQ071993	1987	40
Whippendell Wood	Y		66.9	165.3	TQ076978	1986	41
Wormley-Hoddesdonpark Wood South	Y	Y	192.5	475.6	TL331068	1984	42
Wormley-Hoddesdonpark Wood North	Y	Y	146.3	361.5	TL325075 and TL352085	1986	43

See also

• List of SSSIs by Area of Search

Notes

^A  Data rounded to one decimal place.

^B  Grid reference is based on the British national grid reference system, also known as OSGB36, and is the system used by the Ordnance Survey.^[7]

^C  Those SSSIs with more than one OS grid reference are composed of multiple sections, separated by non-SSSI land.^[7]

^D  Site notification consists of designating a site as an SSSI and consulting with the owner(s). This list uses the date notified under Section 28 of the Wildlife and Countryside Act 1981.

^E  Link to maps using the Nature on the Map service provided by Natural England.

References