Identification. The Nyamwezi and Sukuma are two closely related ethnic groups that live principally in the region to the south of Lake Victoria in west-central Tanzania. When using ethnic names, they describe themselves as "Banyamwezi" (sing. Munyamwezi) and "Basukuma" (sing. Musukuma) respectively; they refer to their home areas as "Bunyamwezi" or "Unyamwezi," and as "Busukuma." The term "Sukumaland" is sometimes used for the Sukuma area. The name "Sukuma" literally means "north," but it has become a term of ethnic identification.
Location. The Nyamwezi and Sukuma region lies between 2°10′ and 6°20′ S and 31°00′ and 35°00′ E. The Nyamwezi "home" area is in Tabora Region and western Shinyanga Region, and Sukumaland lies to the north and east, covering eastern Shinyanga Region and also Mwanza Region. There has been much population movement in and beyond these areas, and members of both groups have also settled on the coast and elsewhere. Sukuma and members of other groups, such as the Tusi and the Sumbwa, are often found in Nyamwezi villages, but Sukuma villages are ethnically more homogeneous. Sukuma took over the Geita area of Mwanza Region during the colonial period, and they have expanded farther west since then. They have also moved down into Nzega and the neighboring Igunga District, and some have migrated into the southern highland areas of Tanzania, and even into Zambia. These Sukuma movements have stemmed from political factors, such as colonial cattle-culling policies, and from local overcrowding and deteriorating soil conditions. The two areas form a large and undulating tableland, most of it at elevations between 1,150 and 1,275 meters. There are several rivers in the region, but most of them do not flow during the drier months. The year can be broadly divided into a rainy season, from about November until April, and a dry season the rest of the year. Average annual rainfall is about 75 centimeters for most of the Sukuma area, and about 90 centimeters for Unyamwezi, but there is much variation from year to year and from place to place. Across the region, there is a regular sequence of soil and vegetation zones. The upper levels are dry woodland typified by trees of the Brachystegia-Isoberlinia association; these areas are often called miombo country, after one of these trees. Lower areas of grass and thornbush steppe are also common, and in Sukumaland there are large tracts of park steppe interspersed with baobabs.
Demography. Estimates of the modern population are difficult to make because Tanzanian censuses no longer record the ethnic affiliation of enumerated local populations. According to Tanzanian newspaper reports based on official estimates, there were 1 to 1.5 million Nyamwezi and between 3 and 3.5 million Sukuma in 1989. Census figures for 1978 show a wide range of population densities, from 73.3 per square kilometer in the Mwanza Region to 10.7 per square kilometer in the Tabora Region. Since then, population growth in Tanzania generally has been about 2.8 percent per annum, but densities have also been influenced by population movement.
Linguistic Affiliation. Although sometimes classed as two closely related languages, Nyamwezi and Sukuma are probably best considered as a single Bantu language with several mutually intelligible dialects. These features include a seven-vowel system, use of tone, true negative tenses, class prefixes to indicate size, and the restriction of double prefixes to determined situations. In addition to their own dialect, most people today also speak Swahili.