The Rugusye River[a] (French: Rivière Rugusye) is a river that defines part of the border between Burundi and Tanzania.

[3] The area is quite sparsely populated, with 32 inhabitants per square kilometer as of 2016.

The warmest month is September, when the average temperature is 25 °C (77 °F), and the coldest is December, with 20 °C (68 °F).

Two development projects were underway in 2000 led by SOSUMO (Burundi Sugar Company) and the Ruyigi DPAE (Provincial Directorate of Agriculture and Livestock).

These involved creating irrigation and drainage networks separated by dikes or tracks.