Question: Which ethnic group which Tonga people of Zambia and Zimbabwe belong inhabit a geographical area stretching east and southward from Central Africa across the African Great Lakes region down to Southern Africa?

Context articles: Sukuma people
List of companies of Tanzania
Mzungu
East African Community
Mbochi people
Tonga people (Zambia and Zimbabwe)
Bantu peoples
List of African Great Lakes kingdoms
Tonga people (Malawi)
Haplogroup E-V38

The Sukuma are a Bantu ethnic group inhabiting the southeastern African Great Lakes region.
 They are the largest ethnic group in Tanzania, with an estimated 8.9 million members or 16 percent of the country's total population.
 Sukuma means "north" and refers to "people of the north."
 The Sukuma refer to themselves as "Basukuma" (plural) and "Nsukuma" (singular).
 They speak Sukuma, which belongs to the Bantu branch of the Niger-Congo family.
Tanzania is a large country in Eastern Africa within the African Great Lakes region.
 Parts of the country are in Southern Africa.
 It is bordered by Kenya and Uganda to the north; Rwanda, Burundi, and the Democratic Republic of the Congo to the west; Zambia, Malawi, and Mozambique to the south; and by the Indian Ocean to the east.
 Kilimanjaro, Africa's highest mountain, is in northeastern Tanzania.
Mzungu (] ) is a Bantu language term used in the African Great Lakes region to refer to people of European descent.
 It is a commonly used expression among Bantu peoples in Kenya, Tanzania, Malawi, Rwanda, Burundi, Uganda, Democratic Republic of Congo, Comoros, Mayotte and Zambia, dating back to the 18th century.
 Literally translated it meant "someone who roams around" or "wanderer."
 The term was first used in the African Great Lakes region to describe European explorers in the 18th century, apparently as a result of their extensive travelling all over the world.
 The word Mzungu comes from Kiswahili, where "zungu" or "zunguka" is the word for spinning around on the same spot.
 "Kizunguzungu" is Kiswahili for a dizziness.
 The term is now used to refer to "someone with white skin" or "white skin".
 The word Mzungu in Swahili can also mean someone who speaks English.
 A person in Swahili is "Mtu" and "English" in Swahili is "Kizungu" hence the combination of the two words to make up a word "Mzungu."
The East African Community (EAC) is an intergovernmental organisation composed of six countries in the African Great Lakes region in eastern Africa: Burundi, Kenya, Rwanda, South Sudan, Tanzania, and Uganda.
 John Magufuli, the president of Tanzania, is the EAC's chairman.
 The organisation was founded in 1967, collapsed in 1977, and revived on 7 July 2000.
 In 2008, after negotiations with the Southern Africa Development Community (SADC) and the Common Market for Eastern and Southern Africa (COMESA), the EAC agreed to an expanded free trade area including the member states of all three organizations.
 The EAC is an integral part of the African Economic Community.
The Mbochi (or M'Boshi) are descendants of the Bantu people.
 Their language originates from the regions of the African Great Lakes where they began, after a long migration from the east to the centre, over the years, until 1850.
 This central African ethnic group as a population is concentrated in the northern region of the Republic of the Congo.
 The current Congolese president, Denis Sassou-Nguesso, as well as many senior government officials, belong to this group.
 Mbochi is the traditional language spoken in the northern regions of la Cuvette (districts of Boundji; Ngoko; d'Owando, d'Oyo; Bokouélé; Tongo; Tchikapika and of Mossaka) also in the region of the Plateaux (districts of Olombo ; Abala, Allembé and Ogogni).
The Tonga people of Zambia and Zimbabwe (also called 'Batonga') are a Bantu ethnic group of southern Zambia and neighbouring northern Zimbabwe, and to a lesser extent, in Mozambique.
 They are related to the Batoka who are part of the Tokaleya people in the same area, but not to the Tonga people of Malawi.
 In southern Zambia they are patrons of the Kafue Twa.
Bantu peoples is used as a general label for the 300–600 ethnic groups in Africa who speak Bantu languages.
 They inhabit a geographical area stretching east and southward from Central Africa across the African Great Lakes region down to Southern Africa.
 Bantu is a major branch of the Niger–Congo language family spoken by most populations in Africa.
 There are about 650 Bantu languages by the criterion of mutual intelligibility, though the distinction between language and dialect is often unclear, and "Ethnologue" counts 535 languages.
The African Great Lakes kingdoms refers to the numerous historic kingdoms in the African Great Lakes region.
 These polities existed in the eighteenth and nineteenth centuries, and had similar and yet sometimes distinct cultures, values and traditions.
 The Great Lakes kingdoms were found in Southeast Africa and some parts of Central Africa, in what is present-day northwest Tanzania, south Uganda, some parts of Rwanda, and Eastern Congo.
The Tonga (also called "Batonga, Lake Shore Tonga" or "Nyasa Tonga") are an ethnic group living in northern Malawi on the shores of Lake Malawi in the region around Nkhata Bay and Chintheche.
 They are to be distinguished from the Tonga people of Zambia and Zimbabwe, whose language belongs to a different branch of the Bantu family.
Haplogroup E-V38 is a human Y-chromosome DNA haplogroup.
 It is primarily distributed in Africa.
 E-V38 has two basal branches, E-M329 (formerly E1b1c) and E-M2 (formerly E1b1a); the E-M329 subclade is today almost exclusively found in Ethiopia.
 E-M2 is the predominant subclade in Western Africa, Central Africa, Southern Africa and the African Great Lakes, and occurs at low frequencies in North Africa and Middle East.
 E-M2 has several subclades, but many members are included in either E-L485 or E-U175.