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Location United Kingdom, South West
Central coordinates 5o 28.87' West  50o 8.00' North
IBA criteria C6
Area 54 ha
Year of IBA assessment 2007

Royal Society for the Protection of Birds

Site description This IBA is Cornwall's largest reedbed supporting typical breeding, wintering and passage species.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Eurasian Bittern Botaurus stellaris breeding  1994-1999  2 males only  good  C6  Least Concern 
Aquatic Warbler Acrocephalus paludicola passage  1994-1998  6 individuals  good  C6  Vulnerable 
Aquatic Warbler Acrocephalus paludicola passage  2001-2006  1 individuals  good  C6  Vulnerable 

IBA Monitoring

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

No known threats no known threats happening now small area/few individuals (<10%) no or imperceptible deterioration low

Botaurus stellaris Eurasian Bittern 2 0 breeding pairs 0 very unfavourable
Acrocephalus paludicola Aquatic Warbler 6 1 individuals 17 very unfavourable

Whole area of site (>90%) covered by appropriate conservation designation  A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species  Not assessed  medium 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Marazion Marsh RSPB Reserve 53 is identical to site 53  
Marazion Marsh Site of Special Scientific Interest 60 protected area contains site 54  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland)   major

Land use

Land-use Extent (% of site)
nature conservation and research major

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Marazion Marsh. Downloaded from on 23/10/2016

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