Middle Ridge, Babeldaob

Country/territory: Palau

IBA Criteria met: A1, A2 (2008)
For more information about IBA criteria please click here

Area: 13,767 ha

Palau Conservation Society
Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2018 medium favourable low
For more information about IBA monitoring please click here

Site description
The Middle Ridge IBA encompasses the whole elevated area that runs north-south through the center of Babeldaob Island. This IBA is bordered on almost all sides by the Compact Road or other secondary roads. The eastern boundary in Ngiwal follows the edge of the mangrove inland of Ngemai Bay and comes back to join the Compact Road. The southern boundary of the Middle Ridge IBA is contiguous with parts of the ridge that defines the Ngerikiil Watershed. The western boundary is defined as the old Japanese road, the southern boundary follows the Ikoranges River, the eastern boundary adjoined the Compact Road, and the north is contiguous with the rest of the IBA. Much of the IBA is composed of public lands.

Key biodiversity
All of Palau’s restricted-range bird species are captured in this IBA, with the exception of the Giant White-eye. Bird species also found in this IBA are the Blue-faced Parrotfinch, White-breasted Woodswallow, Common Moorhen, Pacific Black Duck, and the Grey Nightjar. Although these species do not trigger IBA criteria, they are locally significant due either to their limited numbers or distribution. Some (the Blue-faced Parrotfinch, White-breasted Woodswallow and Giant White-eye) are listed on the US Endangered Species List.

Non-bird biodiversity: This IBA includes the headwaters of all of Babeldaob’s major watersheds. The headwaters of the Ngermeskang River, the largest in Palau, is included in this IBA. The upland forests in Babeldaob are considered the most diverse in Micronesia and have a high rate of endemism (Costion and Kitalong, 2005).

Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Middle Ridge, Babeldaob. Downloaded from on 06/02/2023.