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Location Thailand, Krabi
Central coordinates 98o 51.00' East  7o 57.00' North
IBA criteria A1, A3, A4i
Area 11,400 ha
Altitude 0 - 200m
Year of IBA assessment 2004

Bird Conservation Society of Thailand

Site description The IBA comprises the estuary of the Krabi river, immediately upstream and downstream of Krabi town, on the west coast of peninsular Thailand. Mangroves cover c.10,200 ha, and have mostly been degraded by logging. Intertidal sand- and mudflats cover a further c.1,200 ha at the river mouth. The site also includes a number of limestone karst outcrops. The site is included within Krabi Estuary Ramsar Site, which was designated in 2001and covers 21,299 ha.

Key Biodiversity Na Muang Krabi is an important site for migratory waterbirds. The globally threatened Nordmann's Greenshank Tringa guttifer and Chinese Egret Egretta eulophotes are regular winter visitors to the site, while another globally threatened species, Masked Finfoot Heliopais personata, is a regular non-breeding visitor. The site supports resident populations of two globally near-threatened species, Mangrove Pitta Pitta megarhyncha and Brown-winged Kingfisher Halcyon amauroptera, while a third globally near-threatened species, Asian Dowitcher Limnodromus semipalmatus, occurs regularly as a passage migrant. In addition, the site supports of 1% of the Asian biogeographic populations of Common Tern Sterna hirundo and Lesser Crested Tern S. bengalensis. The site qualifies under criterion A3 because it supports one species (Masked Finfoot) restricted to the Indochinese Tropical Moist Forests (Biome 09).

Non-bird biodiversity: No information is available about other globally threatened species at the site.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Chinese Egret Egretta eulophotes non-breeding  2004  present  A1  Vulnerable 
Masked Finfoot Heliopais personatus non-breeding  2004  present  A1  Endangered 
Spotted Greenshank Tringa guttifer winter  2004  present  A1, A4i  Endangered 
Lesser Crested Tern Thalasseus bengalensis winter  2004  present  A4i  Least Concern 
Common Tern Sterna hirundo winter  2004  present  A4i  Least Concern 

IBA Monitoring

2013 high not assessed high

Human intrusions and disturbance work and other activities happening now majority/most of area/population (50-90%) slow but significant deterioration high
Natural system modifications other ecosystem modifications happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution industrial & military effluents - type unknown/unrecorded happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Residential and commercial development commercial and industrial development likely in short term (within 4 years) some of area/population (10-49%) very rapid to severe deterioration high
Transportation and service corridors shipping lanes likely in short term (within 4 years) some of area/population (10-49%) very rapid to severe deterioration high

Whole area of site (>90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  The conservation measures needed for the site are being comprehensively and effectively implemented  high 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Krabi Estuary Wetlands of International Importance (Ramsar) 21,299 protected area contains site 11,400  


IUCN habitat Habitat detail Extent (% of site)
Artificial - terrestrial   -
Coastline   -

References Bird Conservation Society of Thailand Bulletin 20(12) (December 2003). 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. Office of Environmental Policy and Planning (1999) Directory of internationally important wetlands in Thailand. Bangkok: Ministry of Science, Technology and Environment. (In Thai.) Ramsar Bureau website http//:

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Na Muang Krabi. Downloaded from on 26/10/2016

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