The Dayak /ˈdaɪ.ək/ or Dyak or Dayuh are one of the native groups of Kalimantan. It is a loose term for over 200 riverine and hill-dwelling ethnic subgroups, located principally in the central and southern interior of Borneo, each with its own dialect, customs, laws, territory, and culture, although common distinguishing traits are readily identifiable. Dayak languages are categorised as part of the Austronesian languages in Asia. The Dayak were animist in belief; however, many converted to Islam and since the 19th century there has been mass conversion to Christianity