Rwanda-Rundi or Ruanda-Rundi is a Bantu language, actually a dialect continuum

Dialect continuum

A dialect continuum, or dialect area, was defined by Leonard Bloomfield as a range of dialects spoken across some geographical area that differ only slightly between neighboring areas, but as one travels in any direction, these differences accumulate such that speakers from opposite ends of the...

, of Central Africa. Neighboring dialects are mutually intelligible, but more distant ones may not be. Two dialects, Kirundi

Kirundi

Kirundi, also known as Rundi, is a dialect of the Rwanda-Rundi language spoken by some 8.7 million people in Burundi and adjacent parts of Tanzania and Congo-Kinshasa, as well as in Uganda. It is the official language of Burundi...

 and Kinyarwanda, have been standardized as official languages, of Burundi

Burundi

Burundi , officially the Republic of Burundi , is a landlocked country in the Great Lakes region of Eastern Africa bordered by Rwanda to the north, Tanzania to the east and south, and the Democratic Republic of the Congo to the west. Its capital is Bujumbura...

 and Rwanda

Rwanda

Rwanda or , officially the Republic of Rwanda , is a country in central and eastern Africa with a population of approximately 11.4 million . Rwanda is located a few degrees south of the Equator, and is bordered by Uganda, Tanzania, Burundi and the Democratic Republic of the Congo...

. (See Kirundi

Kirundi

Kirundi, also known as Rundi, is a dialect of the Rwanda-Rundi language spoken by some 8.7 million people in Burundi and adjacent parts of Tanzania and Congo-Kinshasa, as well as in Uganda. It is the official language of Burundi...

and Kinyarwanda for details.) In Rwanda, Burundi, Uganda

Uganda

Uganda , officially the Republic of Uganda, is a landlocked country in East Africa. Uganda is also known as the "Pearl of Africa". It is bordered on the east by Kenya, on the north by South Sudan, on the west by the Democratic Republic of the Congo, on the southwest by Rwanda, and on the south by...

, and the Democratic Republic of the Congo

Democratic Republic of the Congo

The Democratic Republic of the Congo is a state located in Central Africa. It is the second largest country in Africa by area and the eleventh largest in the world...

, the speakers are the Hutu

Hutu

The Hutu , or Abahutu, are a Central African people, living mainly in Rwanda, Burundi, and eastern DR Congo.-Population statistics:The Hutu are the largest of the three peoples in Burundi and Rwanda; according to the United States Central Intelligence Agency, 84% of Rwandans and 85% of Burundians...

, Tutsi

Tutsi

The Tutsi , or Abatutsi, are an ethnic group in Central Africa. Historically they were often referred to as the Watussi or Watusi. They are the second largest caste in Rwanda and Burundi, the other two being the Hutu and the Twa ....

, and Twa

Great Lakes Twa

The Great Lakes Twa, also known as Abatwa or Ge-Sera, or in English Batwa, are a pygmy people who are generally assumed to be the oldest surviving population of the Great Lakes region of central Africa, though currently they live as a Bantu caste...

. The other dialects are spoken in Tanzania; Ha

Ha language

Ha, also known with the Bantu language prefix as Giha, Ikiha, or Kiha, is a Bantu language spoken by the Ha people of the Kigoma region of Tanzania which is closely related to the languages of Rwanda and Burundi; neighboring dialects are mutually intelligible with Kirundi.-External links:* * *...

, with one million speakers, is the most important.