From the Wikipedia page 
Urambo District is one of the seven districts of the Tabora Region of Tanzania. It is bordered to the north by the Kaliua District, to the east by the Uyui District, to the southeast by the Sikonge District, and to the southwest by the Katavi Region. Its administrative seat is the town of Urambo.
In 2002, Urambo District was administratively divided into 26 wards. As of 2012, only 16 wards remained after Kaliua District was split off.