Alluvial flat in this area formed in Singkil River estuary and some other small rivers.
Giesen and van Balen (1992) reported Storm Stork Ciconia stormi, Lesser Adjutant Leptoptilos javanicus and White-winged Duck Cairina scutulata from this area. The area might also important for other waterbirds.
Non-bird biodiversity: Other biodiversity include Crocodylus porosus, Hylobates lar, Pongo pygmaeus, Callsciurus prevostii, Helarctos malayanus, and Panthera tigris.
Habitat and land use
Habitat type of this area are peat swamp forest (85%), wetlands in coastal (10%), and agriculture (5%). Around 80% forested, and 20% used for agriculture land and fisheries (including for transmigration)
Pressure/threats to key biodiversity
Logging; deforestation for infrastructure development for transmigration and for oil palm plantation.
65,000 ha of this area is proposed as Nature Reserve (Cagar Alam) by FAO in 1982 (Giesen and van Balen 1992).