There is more than 126 different dilects languages in Tanzania of which represents each tribe. If you grow up in the village like Essau Pwelle from Yenzebwe village. You have to learn at least 6 other languages in order to communicate with your neighbouring tribes. Essau speaks 9 languages including English, and Kiswahili. 3 from other tribes in his village: (Walambya, Wamalila, and Wanyiha). 

Here below are tribes around geographic area where Essau grow up. The one is italized are those tribes language that Essau can speak fluently:  Wabemba (Zambia), Wachona (Zambaia), Wafipa (Rukwa region), Wahehe (Iringa region), Wakinga Iringa, and Mbeya region), Walala (Zambia), Wamambwe (Tanzania, and Zambia), Wangoni (Ruvuma region), Wanyanja, (Zambia), Wanyakyusa, Wasafwa, Wasangu (Iringa and, Mbeya), Watumbuka (Malawi, and Zambia). You are welcome to visit this page again to learn more about other tribes. Remember most of tribes mentioned in here are those part of the BANTU ethnic group. To learn more about Bantu meaning: Watu in Kiswahili, and  People in English. You may visit this site: www.kaa-umati.co.uk