email a friend
printable version
Location Taiwan (China), Penghu
Central coordinates 119o 30.00' East  23o 19.00' North
IBA criteria A4i
Area 226 ha
Altitude 0 - 49m
Year of IBA assessment 2004

Chinese Wild Bird Federation

Site description Extent of this site: comprised of S. Tiechen, Touchin, and Houdizai Islets. S. Tiechen and Touchin Islets are located among Wangan, Shi, and Ping Islets; Houdizai Islet is to the south of Chiangjun Islet. S. Tiechen Islet is formed by 2 wave-eroded plateaus, a large and a small one, perched on a wave-eroded terrace. The rocky islet is covered with hard volcanic breccia. The tops of the plateaus are the main roosting sites for Greater Crested Tern in summer. Touchin Islet is formed from more than 10 coral reefs and 1 main islet. Looking at the island from the north, it looks like a turban which gives it its name (touchin meaning turban). The islet being surrounded by cliffs makes it very difficult for humans to climb up on it, and it has become an activity area for many species of gulls and terns, especially the Greater Crested and Bridled Terns. Houdizai Islet is formed from columnar, slabs, and porous basalts. On the north side, on the wave-eroded terrace, is a sand beach. Clumps of grass dominate this flat islet. Formosan Peacock-plume Chioris formosana, Zoysia matrella, Ipomoea obscura, and Lalang Grass Imperata cylindrica are the dominant species. Low stone walls and a fort made of basalt are found in this islet, so it is believed that this area was formally used as farms and a military station.

Key Biodiversity IBA A4iii Criterion Species: a variety of gulls and terns that breed here in summer. • In summer, many Roseate Terns breed and roost on Houdizai Islet. The average count is 600-800 birds. In June 1998, a maximum of 1,000 was seen. Greater Crested Terns mainly roost on S. Tiechen and Touchin Islets. The number of birds during breeding season is about 200. Bridled Terns on Touchin Islet number less than 1,000, but at least 400-500. • In addition to these 3 common terns, 19 other species have been recorded. Six are protected species: Little Tern, Bridled Tern, Black-naped Tern, Eastern Collared Pratincole, Brown Noddy, and Brown Shrike.

Non-bird biodiversity: • The Green Turtle Chelonia mydas japonica is an endangered protected species found in this area.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greater Crested Tern Thalasseus bergii breeding  2001  200 individuals  good  A4i  Least Concern 
Roseate Tern Sterna dougallii breeding  2001  600-1,000 individuals  good  A4i  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Penghu Wangan Island Wildlife Refuge 23 protected area contained by site 23  


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

Protection status (PA)

References • Lin, C. S. et al. 1991. Geology and Landforms of the Penghu Archipelago. Taiwan Provincial Education Board. • Lin, C. S. et al. 1997. Interpretation Handbook for the Conservation of the Basaltic Landscapes of Penghu. Penghu County Government. • Jeng, C. S. 1999. Avian Resources of the Penghu Archipelago. Penghu County Government. • WBFT. Bird Database.

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 (2016) Important Bird and Biodiversity Area factsheet: Southern Sea Islets. Downloaded from on 23/10/2016

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