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Location Réunion (to France), Entre-Deux,Le Tampon
Central coordinates 55o 30.00' East  21o 10.00' South
IBA criteria A1, A2, A4ii
Area 3,000 ha
Altitude 550 - 2,350m
Year of IBA assessment 2001

Site description Grand Bassin–Le Dimitile is on the southern slopes of the volcanic Piton des Neiges massif, which are now separated from the summit by the Cirque de Cilaos and consist of a south-facing escarpment incised by eight small ravines. The site extends from the south-east rim of the Cirque de Cilaos (Sommet de l’Entre-Deux, 2,350 m) down to around 550 m on the slopes above the Bras de la Plaine river near La Commune d’Entre-Deux. Most vegetation is mixed montane forest; small areas of bare rock, scree, montane shrubland or bushland and thicket are found in the higher parts, and deforested areas with exotic vegetation (including some cultivation) occur lower down.

Key Biodiversity See Box and Table 2 for key species. The site is one of the most likely to hold breeding Pterodroma aterrima, based on the fact that seven specimens have been found nearby (five recently), and some descriptions of seabirds by local people may refer to this species. Pterodroma baraui may also breed at high altitude. All of the forest-living native birds of La Réunion occur, except Coracina newtoni, along with an important population of Puffinus lherminieri. In 1997, 3–5 pairs of Circus maillardi were present.

Non-bird biodiversity: Endemic plant communities: forest, shrubland and bushland and thicket rich in endemic plants.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Mascarene Petrel Pseudobulweria aterrima breeding  present  A1  Critically Endangered 
Puffinus lherminieri breeding  300 breeding pairs  A4ii  Not Recognised 
Mascarene Swiftlet Aerodramus francicus resident  1998  present  A1, A2  Near Threatened 
Mascarene Paradise-flycatcher Terpsiphone bourbonnensis resident  1998  present  A2  Least Concern 
Olivaceous Bulbul Hypsipetes borbonicus resident  1998  present  A2  Least Concern 
Mascarene Grey White-eye Zosterops borbonicus resident  1998  present  A2  Least Concern 
Reunion Olive White-eye Zosterops olivaceus resident  1998  present  A2  Least Concern 
Reunion Stonechat Saxicola tectes resident  1998  present  A2  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Pitons, cirques and remparts of Reunion Island World Heritage Site 105,838 protected area overlaps with site 2,516  

Land use

Land-use Extent (% of site)
agriculture -
not utilised -

References Anon. (1998), Attié et al. (1998), Barré (1988), Cadet (1980), Le Corre and Gerdil (in prep.), Jouanin (1987).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Grand Bassin - Le Dimitile. Downloaded from on 25/10/2016

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