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Location Turkey, Bursa
Central coordinates 29o 31.00' East  40o 26.00' North
IBA criteria A1, B2
Area 37,930 ha
Altitude 87 m
Year of IBA assessment 2004

Doga Dernegi (Partner Designate)

Site description A tectonic freshwater lake with a max. depth of 80 m. Small deltas supporting extensive reedbeds (Phragmites) have formed where streams enter the lake; a levee has been constructed to prevent flooding. Arable land, olive groves and Populus plantations surround the lake. Water is abstracted for industrial and irrigation purposes. The town of Ýznik attracts many tourists.

Key Biodiversity The site is important for breeding waterbirds.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Black-crowned Night-heron Nycticorax nycticorax breeding  250 breeding pairs  B2  Least Concern 
Pygmy Cormorant Microcarbo pygmaeus breeding  1995  30 breeding pairs  A1  Least Concern 

IBA Monitoring

2013 medium near favourable negligible
Medium - based upon reliable but incomplete / partially representative data

Natural system modifications dams & water management/use - abstraction of surface water (commercial use) happening now some of area/population (10-49%) slow but significant deterioration medium
Natural system modifications dams & water management/use - dams (size unknown) happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution agricultural & forestry effluents - herbicides and pesticides happening now some of area/population (10-49%) slow but significant deterioration medium

Wetlands (inland) Standing freshwater  0 0 good (> 90%) moderate (70-90%) near favourable

Microcarbo pygmaeus Pygmy Cormorant 65 66 - 100 favourable

Little/none of site covered (<10%)  No management planning has taken place  Unknown  negligible 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Iznik Golu SIT (Law on Protection of Cultural and Natural Assets No. 2863) 29,830 protected area contained by site 29,830  
İznik Lake Wetlands of International Importance (Ramsar) 0 is identical to site 0  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater; Water fringe vegetation  95%
Artificial - terrestrial Perennial crops, orchards and groves  5%

Land use

Land-use Extent (% of site)
agriculture 5%
fisheries/aquaculture 10%
water management 95%
tourism/recreation 10%
urban/industrial/transport 25%

Protection status National High International None29,830 ha of IBA covered by SÝT (Iznik Gölü, 29,830 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: İznik Lake. Downloaded from on 29/10/2016

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