Bemba is a Bantu language spoken in parts of Zambia, particularly the Northern, Luapula, Copperbelt and Northwestern Central provinces, the Democratic Republic of the Congo and Tanzania by about 3.6 million people.
Bemba is a national (official) language in Zambia and is used as a lingua franca in many areas, particularly cities and in Copperbelt Province. It is also used on the radio.
The spelling of Bemba was standardised between 1972 and 1977 by the Zambian Ministry of Education.
source
wikipedia.org,
omniglot.com &
ethnologue.com