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Location Netherlands, Noord-Brabant,Zuid-Holland
Central coordinates 4o 30.00' East  51o 42.00' North
IBA criteria A4iii, B1i, B2, C3, C4
Area 4,300 ha
Year of IBA assessment 2000

Vogelbescherming Nederland

Site description A stagnant 17-km long freshwater lake, located between Haringvliet (024) and Biesbosch (051), bordered by reedbeds and grassland polders. The water-level varies, depending on the river supply. This site, together with site 024, formed part of a single, larger site (former site NL047) in the previous international IBA inventory (Grimmett and Jones 1989).

Key Biodiversity The site is especially important for roosting geese from surrounding feeding areas, although there have been few counts of numbers. The average seasonal peak number of waterbirds during 1992-1996 exceeded 20,000.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Barnacle Goose Branta leucopsis winter  1988-1991  1,032 individuals  good  B2  Least Concern 
Gadwall Mareca strepera non-breeding  1988-1992  326 individuals  good  B1i, C3  Least Concern 
A4iii Species group - waterbirds unknown  20,000 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Esscheplaat Nature Conservation Law 97 protected area contained by site 97  
Esscheplaat, Zeehondenplaat en Sasseplaat Natural Monument 235 protected area contained by site 235  
Esscheplaat, Zeehondenplaat en Sasseplaat II Natural Monument 30 protected area contained by site 30  
Hollands Diep Wetlands of International Importance (Ramsar) 4,050 protected area overlaps with site 4,050  
Hoogezandse Gorzen Natural Monument 40 protected area contained by site 40  
Oosterse Slobbegorzen Natural Monument 55 protected area contained by site 55  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater  90%
Artificial - terrestrial Highly improved re-seeded landscapes  10%

Land use

Land-use Extent (% of site)
agriculture 5%
fisheries/aquaculture 80%
water management 100%
nature conservation and research 8%
tourism/recreation 90%
urban/industrial/transport 10%
hunting 30%

Protection status National Low International None235 ha of IBA covered by Natural Monument (Esscheplaat, Zeehondenplaat en Sasseplaat, 235 ha). 30 ha of IBA covered by Natural Monument (Esscheplaat, Zeehondenplaat en Sasseplaat II, 30 ha). 40 ha of IBA covered by Natural Monument (Hoogezandse Gorzen, 40 ha). 55 ha of IBA covered by Natural Monument (Oosterse Slobbegorzen, 55 ha). 97 ha of IBA covered by Nature Reserve (Esscheplaat, 97 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Hollands Diep. Downloaded from on 27/10/2016

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