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Location United Kingdom, South East
Central coordinates 1o 7.63' West  50o 49.61' North
IBA criteria C7
Area 1,246 ha
Altitude 0 - 3m
Year of IBA assessment 2007

Royal Society for the Protection of Birds

Site description A large industrialized estuary that includes one of the four largest expanses of mudflats and tidal creeks on the south coast of Britain. The IBA holds important numbers of wintering wildfowl and waders. Branta bernicla are the bernicla subspecies.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Brent Goose Branta bernicla winter  2001-2006  2,925 individuals  good  C7  Least Concern 
Grey Plover Pluvialis squatarola winter  2001-2006  41 individuals  good  C7  Least Concern 
Black-tailed Godwit Limosa limosa winter  2001-2006  264 individuals  good  C7  Near Threatened 
Dunlin Calidris alpina winter  2001-2006  5,672 individuals  good  C7  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Portsmouth Harbour Birds Directive 1,249 is identical to site 1,246  
Portsmouth Harbour Site of Special Scientific Interest 1,264 protected area contains site 1,246  
Portsmouth Harbour Wetlands of International Importance (Ramsar) 1,249 is identical to site 1,246  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Mud flats and sand flats; Rivers and streams; Salt marshes; Tidal rivers and enclosed tidal waters  100%

Land use

Land-use Extent (% of site)
tourism/recreation -

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Portsmouth Harbour. Downloaded from on 19/09/2014

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