Matuumbi, also known as Kimatuumbi and Kimatumbi, is a language spoken in Tanzania in the Kipatimu region of the Kilwa District, south of the Rufiji river.
It is a Bantu language, P13 in Guthrie's classification.
Kimatuumbi is closely related to the Ngindo, Rufiji and Ndengereko languages.
Matuumbi is the augmentative plural of the Kimatuumbi word for 'hills' (singular form: kituumbi, class 7/8).
Ki- is a Bantu noun class prefix attached to nouns of the class that includes languages (cf.