Bahau is one of the Austronesian languages from the island of Borneo; specifically, East Kalimantan, Indonesia. The language of the Kayan people, Bahau is also called Kajan. A Malayo-Polynesian language, it's related to Modang, Segai, and the Punan languages.

This video of Victor Belareq speaking Bahau was recorded by DeAndre A. Espree-Conaway in Indonesia, an archipelago nation of Southeast Asia. Bahau is a Kayanic language with about 19,000 native speakers; the Kayanic languages are a subdivision of the Austronesian language family. These languages are spoken primarily in Borneo by the Kayan, Punan, and other related Indigenous peoples. Bahau is unique insomuch as it is a part of the Kayan dialect group, which is normally affiliated with the Kayan or Kajan people, but it is still not ethnically Kayan.

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