From the Wikipedia page 
Kahama is a town in north-western Tanzania. The town serves as the headquarters of Kahama Urban District.
Kahama is located in the Kahama District of the Shinyanga Region, approximately 109 kilometres (68 mi), by road, south-west of Shinyanga where the regional headquarters are located. The town is approximately 536 kilometres (333 mi), by road, north-west of Dodoma, the capital of Tanzania.