The Koiari (Grass Koiari) numbered about 1,800 in 1973. They live at about 9°S and 148° E in Port Moresby Subprovince, Central Province of Papua New Guinea. They are closely related to the Mountain Koiali (Mountain Koiari) who are found farther inland and at higher elevations.
See also Motu
Groves, Murray, et al. (1957). "Blood Groups of the Motu and Koita Peoples." Oceania 28:222-238.
Lawes, W. G. (1879). "Ethnological Notes on the Motu, Koitapu, and Koiari Tribes." Journal of the Royal Anthropological Institute 8:369-377.