Jagoi, Singai or Bau, is a Dayak language of Borneo. Gumbang dialect may be closer to Tringgus. Bau language is divided into 7 slangs namely Jagoi,- notably from serikin, stass,serasot etc towards kampung selampit in lundu, Bratak,- speakers from kupua(kampung/village) around the Bung Bratak( Mount Bratak), Singai,- a slang use in area and villages around Mount Singai (from Kampung Apar towards kampung Bobak) , Biroih,- speaker from Kampung Skiat area towards Kampung Seropak and towards Peninjau Lama (Serumbu area) who originated from Mount Podam, Krokuang/krokong,- speaker in the Krokong area in Bau, Gumbang in Gumbang area and Tringgus in Kampung Tringgus.