The Matengo people inhabit the southern highlands of Tanzania, a mountainous area of the country which ranges in altitude from 900 to 2000 metres above sea level. The land below an altitude of 1400 metres is generally open woodland known as
miombo, with a heavy concentration of
Caesalpiniaceae trees. The climate is typically cool, averaging a temperature of 18 °C annually and is relatively wet, with an average annual rainfall of about 1000 mm. The function of the pits is to prevent heavy rain washing away the soils on the steep slopes, acting as sedimentation tanks to trap green grasses, thus providing a source of nutrients for the following season. The main crops they grow are staple food crops and coffee under this unique system of cultivation known as "Matengo Pit Cultivation". This cultivation practice usually starts in March following the rainy season. Their method involves a 2-year one-cycle rotation of crops, with a short-fallow period, generally maize, beans and peas. For example, with maize farming amongst the Matengo, in November a farmer will make furrows of roughly 5 centimetres on the ridges and sow the seeds, and commence weeding in December. The maize is then harvested in July and then the field is reduced to fallow until the following March to allow the soils to recover. While practicing a sedentary agriculture style in the country's mountainous region, the Matengo also cultivate the cash crop of coffee. It was introduced to Mbinga District in the 1920s by the son of ex-
Paramount chief Yohani Chrisostomus Makita Kayuni to enable the Matengo to pay
poll tax, a demand of the colonial administration. Since then, the district has developed coffee sustainability due to its cold and wet climatic conditions, which has resulted in the district becoming a major coffee-producing region in Tanzania. This has also improved the economic condition of the people with some families becoming very rich. In the past, the
Mbinga Cooperation Union (MBICU) was responsible for supporting the coffee industry amongst the Matengo farmers. However, in 1993, following economic liberalisation, they filed for bankruptcy as they could not compete with the private growers. ==Social practices==