Sabangau National Park is a national park in Central Kalimantan, Indonesia. The national park is centered on Sabangau River, a blackwater river. It flows through the Kelompok Hutan Kahayan or Sabangau peat swamp forest (5,300 km2). The peat swamp forest is a dual ecosystem, with diverse tropical trees standing on a 10m – 12m layer of peat. The forest is home to the world’s largest orangutan population, estimated at 6,910 individuals in 2003, and other rare or unique species. The total agile gibbon population in the Sabangau catchment is estimated to be in the tens of thousands. Vulnerable bird species include the large green pigeon (Treron capellei) and possibly Storm’s stork (Ciconia stormi) and lesser adjutant (Leptoptilus javanicus). Some 150,000 ha of swamp forest has been recognised as an Important Bird Area (IBA) by BirdLife International