hectare
The hectare (; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), or 10,000 m2, and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is a ...
biological Site of Special Scientific Interest
A Site of Special Scientific Interest (SSSI) in Great Britain or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland is a conservation designation denoting a protected area in the United Kingdom and Isle of ...
(SSSI) near the village of
Cold Ashton
Cold Ashton is a village in South Gloucestershire, England. It is located north of Bath, near the junction between the A46 and A420 roads. The village church has a 14th-century tower and the rest of the church was rebuilt in the 16th century ...
,
South Gloucestershire
South Gloucestershire is a unitary authority area in the ceremonial county of Gloucestershire, South West England. Towns in the area include Yate, Chipping Sodbury, Thornbury, Filton, Patchway and Bradley Stoke, the latter three forming part ...
, notified in 1990.
Monkswood Reservoir, built in 1896 and now owned by
Wessex Water
Wessex Water Services Limited, known as Wessex Water, is a water supply and sewerage utility company serving an area of South West England, covering 10,000 square kilometres including Bristol, most of Dorset, Somerset and Wiltshire and parts of ...
, is situated in the valley of the SSSI. The SSSI is woodland and grassland on the sloping land north and south of the reservoir and its tributary.
The woodlands contain
Fraxinus excelsior
''Fraxinus excelsior'', known as the ash, or European ash or common ash to distinguish it from other types of ash, is a flowering plant species in the olive family Oleaceae. It is native throughout mainland Europe east to the Caucasus and Albor ...
Acer campestre
''Acer campestre'', known as the field maple, is a flowering plant species in the family Sapindaceae. It is native to much of continental Europe, Britain, southwest Asia from Turkey to the Caucasus, and north Africa in the Atlas Mountains. It has ...
Mercurialis perennis
''Mercurialis perennis'', commonly known as dog's mercury, is a poisonous woodland plant found in much of Europe as well as in Algeria, Iran, Turkey, and the Caucasus, but almost absent from Ireland, Orkney and Shetland.St. Catherine's Valley SSSI is immediately to the north-east.
The
Gloucestershire
Gloucestershire ( abbreviated Glos) is a county in South West England. The county comprises part of the Cotswold Hills, part of the flat fertile valley of the River Severn and the entire Forest of Dean.
The county town is the city of Gl ...
Somerset
( en, All The People of Somerset)
, locator_map =
, coordinates =
, region = South West England
, established_date = Ancient
, established_by =
, preceded_by =
, origin =
, lord_lieutenant_office =Lord Lieutenant of Somerset
, lord_ ...
border runs through the reservoir and SSSI. The SSSI is adjacent to the
Limestone Link
The Limestone Link is a long-distance footpath in England, from the Mendip Hills in Somerset to Cold Ashton in Gloucestershire. It is marked by an ammonite waymarker.
The Mendip section starts between Churchill and Rowberrow, near Dolebury ...