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Location Philippines, Region V
Central coordinates 123o 23.00' East  13o 39.00' North
IBA criteria A1, A2
Area 10,112 ha
Altitude 150 - 1,976m
Year of IBA assessment 2001

Haribon Foundation

Site description Mt Isarog is a large, isolated peak in Camarines Sur Province, on the Camarines Peninsula in southeastern Luzon. The mountain is a dormant volcano that rises to 1,976 m. The vegetation there includes parang grasslands mixed with patches of secondary forest from the lowlands to 900m, lowland forest below about 1,000m, and montane forest above about 900 m,including mossy forest above 1,500 m. However, most of the remaining forest is montane, with closed canopy lowland forests restricted to very steep slopes within a narrow band around 890-1,000 m. There is limited tourism in the area mainly to Malabsay Falls of Naga City and the sulfur hot spring of Hiwacloy. Poor roads and security problems related to insurgency are major factors in limiting tourist numbers.

Key Biodiversity Many of the threatened and restricted-range birds of the Luzon Endemic Bird Area have been recorded on Mt Isarog, mainly during expeditions in 1961 and 1988. The substantial area of montane forest which remains there is likely to support important populations of montane species, such as the threatened Whiskered Pitta. The area of lowland forest there is now very small, and Mt Isarog has probably lost much of its value for the conservation of lowland forest birds. The sightings of Philippine Cockatoo in 1988 are particularly interesting, as they represent one of the very few recent records of this rapidly declining species on Luzon.

Non-bird biodiversity: Mt Isarog supports the only known population of the Isarog Shrew-Mouse Archboldomys luzonensis, Isarog Striped Shrew-rat Chrotomys gonzalesi, and Isarog Shrew-rat Rhynchomys isarogensis, as well as many other threatened Luzon endemics, including the Southern Luzon Giant Cloud Rat Phloeomys cumingi.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Nisaetus philippensis resident  2001  present  A1  Not Recognised 
Ceyx melanurus resident  2001  present  A1  Not Recognised 
Whiskered Pitta Pitta kochi resident  2001  present  A1  Near Threatened 
Philippine Cockatoo Cacatua haematuropygia resident  2001  present  A1  Critically Endangered 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Mount Isarog National Park 9,971 protected area contained by site 9,971  


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

Protection status Mt Isarog National Park was declared by Proc. No. 293 on 20 July 1938. It is currently proposed as a natural park under the NIPAS. This park is one of the priority sites under the EU-DENR NIPAP.

Further web sources of information 

Alliance for Zero Extinction (AZE) species/site profile. This site has been identified as an AZE due to it containing a Critically Endangered or Endangered species with a limited range.

References Aguilar et al. (unpublished); Alfonso (unpublished); Alcala and Brown (1998); Goodman and Gonzales (1990); Heaney et al (in press); Rickart et al. (1992).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Mount Isarog National Park. Downloaded from on 26/10/2016

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