Like kings, the queen mothers known in Kirundi language as Abagabekazi had special tombs. They are located on Mpotsa hill, in Rusaka commune of Mwaro province. The location is a sacred forest guarded by appointed ritualists of the Banyange clan. Similar to kings, the bodies of queen-mothers were smoked and enlisted in skins of bulls. The sacred forest of Mpotsa is surrounded by four hills, Nyamigogo, Shana, Nkurunzi and Bunyange. The hill of Curators Biru is famous for its therapeutic water.