Marshy valley of the Drweca river

IBA Criteria

Year of most recent IBA criteria assessment: 2010

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Bean Goose Anser fabalis LC passage 2004-2009 3,300 individuals C7
Greater White-fronted Goose Anser albifrons LC passage 2004-2009 7,000 individuals C7
A4iii Species group - waterbirds n/a passage 2004-2009 5,000-20,000 individuals C4

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2011 not assessed unfavourable not assessed
Was the whole site covered? Yes State assessed by Population
Accuracy of information good

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Rzeka Drwęca Rezerwat Przyrody 1,594 protected area overlaps with site 0
Górznieńsko-Lidzbarski Park Krajobrazowy Park Krajobrazowy 27,536 protected area is adjacent to site 0
Drweca Nature Reserve 444 protected area contained by site 1,287
Doliny Drwęcy Obszar Chronionego Krajobrazu 55,552 protected area overlaps with site 3,136
Dolina Drwęcy Site of Community Importance (Habitats Directive) 12,562 protected area overlaps with site 816
Dolina Dolnej Drwęcy Obszar Chronionego Krajobrazu 16,550 unknown 0
Brodnicki Park Krajobrazowy Park Krajobrazowy 16,889 protected area overlaps with site 0
Bagienna Dolina Drwęcy Special Protection Area (Birds Directive) 3,366 protected area overlaps with site 3,136


IUCN Habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland, Native coniferous woodland, Mixed woodland, Alluvial and very wet forest -
Grassland Steppes and dry calcareous grassland, Humid grasslands, Mesophile grasslands -
Wetlands (inland) Standing freshwater, Rivers and streams, Raised bogs, Water fringe vegetation, Fens, transition mires and springs -
Artificial/Terrestrial Highly improved re-seeded landscapes, Arable land, Ruderal land -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
agriculture -
forestry -
not utilised -
hunting -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Marshy valley of the Drweca river. Downloaded from on 04/12/2022.