|(55,000 cited 1990 census)|
Giangan (also known as Bagobo, Clata, Atto, Eto, Guanga, Gulanga, Jangan) is an Austronesian language of the southern Philippines. It is spoken on the eastern slopes of Mount Apo in Davao del Sur Province, as well as in Davao City (Ethnologue). They occupy a very small territory stretching from Catalunan to Calinan within Davao City.
The nearby Tagabawa language is also known as Bagobo, and is not to be confused with Giangan.
The Lipadas River separated the traditional Tagabawa and Clata territories, while the Talomo River (Ikawayanlinan) was the boundary separating the Tagabawas, Clatas, and Obos. The Davao River separated the traditional Bagobo and Clata territories.