Castillos Lagoon

IBA Justification

Year of most recent IBA criteria assessment: 2008

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population at site IBA criteria triggered
Greater Rhea Rhea americana NT resident 1991-1998 30 individuals A1
Coscoroba Swan Coscoroba coscoroba LC resident 1991-1998 60-325 individuals A4i
Black-necked Swan Cygnus melancoryphus LC resident 1987-1999 20-1,442 individuals A4i
Buff-breasted Sandpiper Calidris subruficollis NT winter 1999 300 individuals A1, A4i
Curve-billed Reedhaunter Limnornis curvirostris LC resident 1999 uncommon A3
Straight-billed Reedhaunter Limnoctites rectirostris NT resident 1999-2008 90 individuals A1, A2
Sulphur-throated Spinetail Cranioleuca sulphurifera LC resident 1999 present A3
Bay-capped Wren-spinetail Spartonoica maluroides LC resident 1999 90 individuals A1, A3
Black-and-white Monjita Xolmis dominicanus VU resident 1999 90 individuals A1
Saffron-cowled Blackbird Xanthopsar flavus EN resident 1999-2007 90 individuals A1
A4iii Species group - waterbirds n/a unknown - 20,000-49,999 individuals A4iii

Note: The current IUCN Red List category may differ from the category that was valid at the time of IBA criteria assessment.

For more information about the IBA criteria, please click here

IBA Protection

Protected area (PA) PA designation PA area (ha) Relationship of PA with IBA Overlap of PA with IBA (ha)
Laguna de Castillos Paisaje Protegido 8,185 protected area contained by site 8,185
Humedales del Este Other Area 260,000 protected area contains site 27,000
Cabo Polonio Parque Nacional 25,820 protected area overlaps with site 0
Bañados del Este y Franja Costera Ramsar Site, Wetland of International Importance 431,536 protected area overlaps with site 27,000
Bañados del Este y Franja Costera UNESCO-MAB Biosphere Reserve 1,245,750 protected area contains site 0
Bañados del Este UNESCO-MAB Biosphere Reserve 200,000 protected area contains site 27,000


IUCN Habitat Habitat detail Extent (% of site)
Grassland Campo grassland -
Marine Coastal/Supratidal -
For further information about the IUCN habitat classification, please click here.

Land use

Land-use Extent (% of site)
rangeland/pastureland -
tourism/recreation -
fisheries/aquaculture -
For further information about the land-use classification, please click here.

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Castillos Lagoon. Downloaded from on 09/06/2023.