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Location Canada, Québec
Central coordinates 69o 31.31' West  47o 56.35' North
IBA criteria A4i, A4iii
Area 4,600 ha
Altitude 0 - 65m
Year of IBA assessment 2008

Bird Studies Canada/Nature Canada

Site description Marais (marsh) de Gros-Cacouna is on the south shore of the St. Lawrence River, about 10 km east of Rivière-du-Loup, Québec. The site encompasses a 10 km stretch of shoreline, that includes mudflats that are up to 1 km wide, and a 2 km wide strip of open water. The site also includes Cacouna Rock, Gros-Cacouna Island and a small bay east of the island. Other habitat types include cultivated fields, dykes and the Cacouna Port.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Grey Plover Pluvialis squatarola passage  1977  10,000 individuals  A4i  Least Concern 
A4iii Species group - waterbirds unknown  1997  50,000-99,999 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Baie Cacouna Sud Wildlife Habitat, Waterfowl Gathering Area 306 protected area contained by site 310  
Baie de l'Isle-Verte Wetlands of International Importance (Ramsar) 2,215 protected area overlaps with site 1,200  
Batture a Belanger Wildlife Habitat, Waterfowl Gathering Area 827 protected area overlaps with site 820  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Intertidal mud, sand or salt flats  -
Sea Open sea  -
Coastline Sea cliffs and rocky shores  -
Artificial - terrestrial Arable land  -

Land use

Land-use Extent (% of site)
agriculture major
hunting major

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Marais de Gros-Cacouna. Downloaded from on 25/10/2014

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