Kalumpang is spoken in the interior of the province of West Sulawesi along the Karama River and its tributaries, with additional villages in the north along the Passa'bua, a tributary of the Lumu River (see maps in Valkama 1987:116, 117).
There are two major dialects in Kalumpang, the Bone Hau dialect and the Karataun dialect, both named after the respective river systems (tributaries of the Karama) where they are principally spoken. Because of extensive dialect chaining in the Kalumpang area, it is unclear how many other, smaller dialects or subdialects should be recognized. See the discussion in Valkama (1987:109).
Currently there are over 20,000 speakers of Kalumpang (Sem Samboy 2012:pers.comm.).
Valkama, Kari. 1987. Kabupaten Mamuju. UNHAS-SIL South Sulawesi sociolinguistic surveys, 1983–1987 (Workpapers in Indonesian Languages and Cultures, 5), edited by Timothy Friberg, 99–117. Ujung Pandang: Summer Institute of Linguistics.