email a friend
printable version
Location Madagascar, Mahajanga
Central coordinates 46o 31.00' East  15o 55.00' South
IBA criteria A1, A2, A3, A4i
Area 148,200 ha
Altitude 0 - 25m
Year of IBA assessment 2001

Asity Madagascar (Affiliate)



Site description The site lies 20 km from Mahajanga. Bombetoka Bay is delimited, in the north, by a line from Katsepy in the west to the headland just north of Boanamary in the east, and, in the south, by the Marovoay flood-plain. The bay consists of mangrove islets (c.43,500 ha) separated by channels (c.21,500 ha at high tide) and mudflats (c.8,500 ha at low tide), with shallow subtidal waters in the estuary. The water is shallow (less than 5 m deep at low tide), except towards the mouth, and is very turbid. Northern mangroves are relatively degraded (3–4 m high), while those toward the south are in better condition; likewise, those on the coast are more intact than those in brackish, inland areas, where the canopy is 6–8 m high. The largest mudflats lie immediately seaward of the mangrove islets. A muddy bar crosses the mouth of the estuary, c.10 m wide and covered with scattered mangroves. The Marovoay wetlands comprise a vast area of rice-fields, marshes with Cyperaceae, and a large reservoir, Lake Amboromalandy.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Madagascar Teal Anas bernieri resident  1997-1998  85 individuals  A1, A2, A3, A4i  Endangered 
Madagascar Grebe Tachybaptus pelzelnii resident  1997-1998  present  A1  Vulnerable 
Lesser Flamingo Phoeniconaias minor non-breeding  1997-1998  present  A1  Near Threatened 
Madagascar Heron Ardea humbloti resident  1997-1998  present  A1, A2, A3  Endangered 
Great Egret Casmerodius albus non-breeding  1997-1998  700 individuals  A4i  Least Concern 
Egretta dimorpha non-breeding  1997-1998  286 individuals  A4i  Not Recognised 
Madagascar Fish-eagle Haliaeetus vociferoides resident  1997-1998  present  A1, A2, A3  Critically Endangered 

Land use

Land-use Extent (% of site)
agriculture -
hunting -
water management -
other -
Notes: Collection of eggs and young of waterbirds.

Other biodiversity Sirenian: Dugong dugon (VU; present, according to local people).

References Delacour (1932), Hawkins (1993a), Langrand (1987), Rabarisoa (1994), Rabarisoa et al. (1995), Ségalen (1956), Thorstrom and Rabarisoa (1995), Watson et al. (1993).

Contribute  Please click here to help BirdLife conserve the world's birds - your data for this IBA and others are vital for helping protect the environment.

Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Bombetoka Bay and Marovoay wetlands. Downloaded from http://www.birdlife.org on 14/07/2014

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