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Location Thailand, Bangkok Metropolis,Chachoengsao,Chon Buri,Phetchaburi,Samut Prakan,Samut Sakhon,Samut Songkhram
Central coordinates 100o 40.00' East  13o 30.00' North
IBA criteria A1, A4i, A4iii
Area 100,000 ha
Altitude 0 - 2m
Year of IBA assessment 2004

Bird Conservation Society of Thailand

Site description The IBA comprises a 195 km-long section of the coastal zone of the Inner Gulf of Thailand, from Laem Phak Bia in the west to Chonburi in the east. Four major rivers, the Mae Klong, Tha Chin, Chao Phraya and Bang Pakong, discharge into the Gulf of Thailand along this stretch of coastline, creating extensive areas of intertidal habitats. The site includes an estimated 23,500 ha of intertidal mudflats, extending over 2 km from the shoreline at low tide in places. Previously, the Inner Gulf of Thailand supported a large area of mangroves. However, this habitat has now been extensively converted to other land uses, and, currently, less than 1,600 ha of mangroves remain, much of which consists of regenerating Avicennia-dominated scrub. Areas that previously supported mangroves now support anthropogenic habitats, including at least 10,600 ha of saltpans and from 40,000 to 80,000 ha of shrimp ponds, many of which are abandoned. Inland of the intertidal zone, the site supports large areas of Suaeda-dominated coastal flats, fish-ponds and rice paddies. Due to high levels of human use and high human population densities, it is unrealistic for more than a small part of the site to be placed under strict conservation management. However, the whole site was defined as a single IBA, because conservation actions aimed at controlling over-exploitation of natural resources and promoting compatible forms of land use are required across the whole site. In 2001, an 87,500 ha section of the IBA around Don Hoi Lot in Samut Songkhram province was designated as a Ramsar Site.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Painted Stork Mycteria leucocephala resident  2004  present  A4i  Near Threatened 
Spot-billed Pelican Pelecanus philippensis non-breeding  2004  present  A1  Near Threatened 
Greater Spotted Eagle Clanga clanga winter  2004  present  A1  Vulnerable 
Lesser Sandplover Charadrius mongolus winter  2004  present  A4i  Least Concern 
Greater Sandplover Charadrius leschenaultii winter  2004  present  A4i  Least Concern 
Spoon-billed Sandpiper Calidris pygmaea winter  2004  present  A1  Critically Endangered 
Common Redshank Tringa totanus winter  2004  present  A4i  Least Concern 
Asian Dowitcher Limnodromus semipalmatus winter  2004  present  A4i  Near Threatened 
Black-tailed Godwit Limosa limosa winter  2004  present  A4i  Near Threatened 
Spotted Redshank Tringa erythropus winter  2004  present  A4i  Least Concern 
Spotted Greenshank Tringa guttifer winter  2004  present  A1  Endangered 
Long-toed Stint Calidris subminuta winter  2004  present  A4i  Least Concern 
Brown-headed Gull Larus brunnicephalus winter  2004  present  A4i  Least Concern 
Whiskered Tern Chlidonias hybrida winter  2004  present  A4i  Least Concern 
A4iii Species group - waterbirds unknown  2004  20,000 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Don Hoi Lot Wetlands of International Importance (Ramsar) 87,500 protected area contained by site 87,500  


IUCN habitat Habitat detail Extent (% of site)
Artificial - terrestrial   -
Wetlands (inland)   -
Coastline Intertidal mud, sand & salt flats; Shallow marine waters, coral reefs & keys  -

Other biodiversity Fish Freshwater Sawfish Pristis microdon (CR)

Related state of the world's birds case studies

References BirdLife International (1998) Proceedings of the Thailand IBA workshop, Bangkok, November 1998. Unpublished report. BirdLife International (2001) Threatened birds of Asia: the BirdLife International Red Data Book. Cambridge, UK: BirdLife International. Erftemeijer, P. L. A. and Jugmonkol, R. (1999) Migratory shorebirds and their habitats in the Inner Gulf of Thailand. Bangkok and Hat Yai: Wetlands International and Bird Conservation Society of Thailand. Wetlands International-Thailand Programme, Publication No.13. Office of Environmental Policy and Planning (1999) Directory of internationally important wetlands in Thailand. Bangkok: Ministry of Science, Technology and Environment. (In Thai.) Round, P .D. (2001) Waterfowl and their habitats in the Gulf of Thailand. Bird Conservation Society of Thailand Bulletin 18(4): 8-16.

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Inner Gulf of Thailand. Downloaded from on 26/10/2014

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