The Ruvyironza rises in the east of Bururi Province to the west of Mount Kikizi (2,145 metres (7,037 ft)).

[1] Most of the rivers in the Nile Basin portion of Burundi flow into the Ruvubu or its main tributary, the Ruvyironza.

[10] At Nyabiraba in central Gitega Province the Ruvyironza has a 728 square kilometres (281 sq mi) drainage basin, with average flow of 10 cubic metres per second (350 cu ft/s).

[11] The laws regarding the public hydraulic zones are not respected in any of the Ruvubu watersheds, but particularly along the Ruvyironza.

[14] In December 2015 torrential rains in the Commune of Mutaho, Gitega Province, devastated fields in the marshes of the Ruvubu and Ruvyironza rivers.

[15] In April 2024 extensive flooding in the Ruvyironza River valley destroyed several hectares of crops in the Commune of Nyabihanga, Mwaro Province.

[19] A 2012 report by the Ministry for Energy and Mines stated that potential developments on the Ruvyironza (Luvi 047, 039, 012) might be able to deliver 21.2MW.