Longhouses are large dwellings built by the Kenyah, Bahau, Modang, Lun Dayeh, and other peoples of the interior highlands of East Kalimantan and surrounding areas in central Borneo. Building a longhouse requires great expenditures of labor and materials as well as considerable skill in wood-working and engineering. Formerly found widely throughout East Kalimantan, longhouses are now built only in a few remote parts of the province; and only in the isolated Apo Kayan plateau are they still the predominant form of dwelling.