Eusideroxylon is a genus of evergreen trees belonging to the Lauraceae family. The genus is possibly monotypic; it includes one accepted species (E. zwageri) and one that is "unresolved" (E. melagangai). It is present in coastal and montane rainforests of Southeast Asia, and in laurel forest habitat. Eusideroxylon are hardwood trees reaching up to 50 metres in height with trunks over 2 metres (6 ft 7 in) in diameter, producing commercially valuable timber. The wood of E. zwageri (Borneo Ironwood or Belian) is impervious to termites, and can last up to 100 years after being cut. Due to extensive logging, it is listed as vulnerable in the IUCN Red List of IUCN, and conservation efforts are underway, with several countries banning imports.