Naasioi is an East Papuan language spoken in the central mountains and southeast coast of Kieta District, Bougainville
Region located in the center of the Buin Plain of southern Bougainville, North Solomons Province, Papua New Guinea.
The wearing of upes, tall conical hats made from bush leaves stretched over a wooden framework, was part of traditional initiation ceremonies in several areas of Bougainville. A widespread custom especially in the central and northern areas of the island before European contact, it has been revived recently in some village areas. Youths may wear the hats for a few days or for as much as a year; one hat may be handed down through generations.
See ORN 00.0839