email a friend
printable version
Location United Kingdom, South East
Central coordinates 0o 30.61' West  51o 26.92' North
IBA criteria B1i, C3, C6
Area 1,878 ha
Altitude 10 - 18m
Year of IBA assessment 2007

Royal Society for the Protection of Birds

Site description These widely scattered water-bodies on the south-west margins of London are used primarily as water-supply reservoirs. Some are now disused and include flooded gravel-pits and alluvial grassland. The shorelines are fringed with dense Salix scrub, and the river and ditch networks support a diverse aquatic flora. The IBA supports large numbers of wintering wildfowl and other waterbirds.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Gadwall Mareca strepera passage  2001-2006  689 individuals  good  B1i, C3  Least Concern 
Gadwall Mareca strepera winter  2001-2006  495 individuals  good  B1i, C3  Least Concern 
Northern Shoveler Spatula clypeata passage  2001-2006  489 individuals  good  B1i, C3  Least Concern 
Smew Mergellus albellus winter  2001-2006  67 individuals  good  C6  Least Concern 

IBA Monitoring

2007 medium unfavourable low
Good - based on reliable and complete / representative data

Residential and commercial development commercial and industrial development likely in long term (beyond 4 years) some of area/population (10-49%) slow but significant deterioration medium
Residential and commercial development tourism and recreation areas happening now small area/few individuals (<10%) slow but significant deterioration low

Mareca strepera Gadwall 580 495 individuals 86 near favourable
Spatula clypeata Northern Shoveler 645 355 individuals 56 unfavourable
Mergellus albellus Smew 28 67 individuals 100 favourable

Most of site (50-90%) covered (including the most critical parts for important bird species)  No management plan exists but the management planning process has begun  Very little or no conservation action taking place  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
South West London Waterbodies Wetlands of International Importance (Ramsar) 828 protected area contained by site 828  
Staines Moor Site of Special Scientific Interest 511 protected area overlaps with site 480  
Wraysbury & Hythe End Gravel Pits Site of Special Scientific Interest 117 protected area overlaps with site 95  
Wraysbury Reservoir Site of Special Scientific Interest 205 protected area contained by site 205  


IUCN habitat Habitat detail Extent (% of site)
Forest Mixed woodland  -
Shrubland Scrub  -
Grassland   -
Wetlands (inland) Rivers and streams; Standing freshwater  -

Land use

Land-use Extent (% of site)
nature conservation and research -
tourism/recreation -
water management -

Contribute  Please click here to help BirdLife conserve the world's birds - your data for this IBA and others are vital for helping protect the environment.

Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: South-west London Waterbodies. Downloaded from on 27/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife