Burundi is divided into 18 provinces, 117 communes, and 2,638 collines (hills). Provincial governments are structured upon these boundaries. In 2000, the province encompassing Bujumbura was separated into two provinces, Bujumbura Rural and Bujumbura Mairie. The newest province, Rumonge, was created on 26 March 2015 from portions of Bujumbura Rural and Bururi.