"The Kairiru language area is situated north-west of Ivewak in the East Sepik Province of Papua New Guinea. Kairiru is spoken on the islands of Kairiru (previously known as D'Urville) (3"20'S 143"33'E), Karesau (Paris) (3"23'S 143"26'E), and Yuo (Guap) (3"24'S 143"29'E), and in several coastal villages situated on the mainland between Cape Karawop and Cape Samein. It is also spoken in the northern and western parts of Mushu Island (Gressien) (3"25'S 143"35'E)."

"East Sepik Province, Wewak district, Kairiru, Yuo, and Karesau islands; mainland coastal villages between Cape Karawop and Cape Samein; north and west Mushu island."

The island of Yuo; nine villages on the island of Kairuru (Brauniak, Koragul, Rumlal, Sham, Shagur, Silisang, Surai, Yauik, and Yuwun); three villages on the island of Muschu (Marai, Small Muschu, and Sup; and two coastal towns (Wewak and Wom).

"Schmidt (1907, 1909) claims Karesau Island also as containing speakers of a dialect of Kairiru, but my data suggests that the present population is mainly Boiken-speaking."