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Location Taiwan (China), Penghu
Central coordinates 119o 40.00' East  23o 39.00' North
IBA criteria A4i
Area 961 ha
Altitude 0 - 28m
Year of IBA assessment 2004

Chinese Wild Bird Federation

Site description Extent of this site: includes Jishan, Dinggou, Little Baisha, Beijiao, Chugua Islets, and Pengpeng Beach. These islets are 2-6 nautical miles to the northeast of Baisha Island. Three types of landforms make up these 6 islets: 1. square terrace: including Jishan, Dinggou, and Little Baisha; 2. rocky reef: including Beijiao and Chugua; and 3. sand flat: including Pengpeng Beach. Jishan, Dinggou, and Little Baisha are square basaltic terraces. All of the cliffs have distinct columns. The top of the terrace is covered with weathered basalt gravel and a little weathered soil. Surrounded by the sea, this area faces a piercingly cold northeast monsoon each winter, and salt levels in the air and soil are quite high. Only a few types of plants can survive under these extreme conditions, and the ground cover is dominated by Sesbania cannabiana, Limonium sinense, Formosan Peacock-plume Chioris formasana, Zoysia matrella and Saltwater Smut Grass Sporobolus virginicus. Basaltic reefs surround the islets which provide plentiful layer to harvest producing income for the locals in winter. Beijiao and Chugua Islets are basalt reef islets and are about 5 m above sea level in average. No plants can survive on this flat terrain. Pengpeng Beach was formed by broken coral. To date, only 3 species of plants have been recorded in this area. These islets provide roosting and breeding sites for the gulls and terns in summer.

Key Biodiversity IBA A4iii Criterion Species: many species of gulls and terns breed here in summer. • Roseate Terns breed and roost on Jishan Islet in summer. Average Counts from 1995 to 1997 were 350 birds. In 1998, the number rose to around 500. • Greater Crested Terns mainly roost on Beijieao and Pengpeng Beach during July and August. Occasionally they were found on Dinggou Islet in late August. The population of the bird is about 300. There are few records of Black-naped Terns roosting and breeding on different islets with the largest group of about 50 or 60 on Little Baisha Islet. In general, there are only about 180 Black-naped Terns in this IBA site, which are fewer than other species. Little Terns are breeding at Pengpeng Beach. Sometimes a few of them fly to Little Baisha Islet and Chugua Islet; there are about 400 birds in total. • In 2000, the Penghu County Government passed a law restricting tourist activities on Little Baisha Islet. After that, almost 1,000 Roseate Terns returned here for breeding. • In addition to the terns and gulls, 41 other species have been recorded. There are 5 protected species: Peregrine Falcon, Little Tern, Bridled Tern, Black-naped Tern, and Brown Shrike.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greater Crested Tern Thalasseus bergii breeding  2001  300 individuals  good  A4i  Least Concern 
Roseate Tern Sterna dougallii breeding  2001  350-500 individuals  good  A4i  Least Concern 
Black-naped Tern Sterna sumatrana breeding  2001  180 individuals  good  A4i  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Penghu Columnar Basalt Nature Reserve 19 protected area contained by site 31  


IUCN habitat Habitat detail Extent (% of site)
Sea   major
Coastline   major

Protection status (PA)

References • Lin, C. H. et al. 1991. Geology and Landforms of the Penghu Archipelago. Taiwan Provincial Education Board. • Lin, C. H. and G. T. Hsieh. 1996. Penghu Columnar Basalt Nature Reserve. Penghu County Government. • Lin, C. S. et al. 1997. Interpretation Handbook for the Conservation of the Basaltic Landscapes of Penghu. Penghu County Government. • Jeng, C. S. and C. R. Hsiao. 1997. Investigation and research on the ecology of birds and plants of Penghu and nearby uninhabited islets. • Jeng, C. S. and C. R. Hsiao. 1998. Investigation and research on the ecology of birds and plants of Penghu and nearby uninhabited islets (2). • Wild Bird Society of Penghu. 1998. Avian resources of Penghu Columnar Basalt Nature Reserve (Jishan, Dinggou, and Little Baisha Islets). WBFT. • Jeng, C. S. 1999. Avian Resources of the Penghu Archipelago. Penghu County Government. • Website:

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Northeastern Sea Islets. Downloaded from on 23/10/2016

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