Rugusye River

The Rugusye River is a river that defines part of the border between Burundi and Tanzania.

Course

The Rugusye River forms to the east of Kabuyenge, in the extreme east of Ruyigi Province, Burundi.
It flows in a west-southwest direction along the border between Burundi and Tanzania to its confluence with the Rumpungwe River, which continues along the border.

Environment

The surroundings of Rugusye are mainly savannah forest.
The area is quite sparsely populated, with 32 inhabitants per square kilometer as of 2016.
The average annual temperature in the area is.
The warmest month is September, when the average temperature is, and the coldest is December, with.
Average annual rainfall is.
The wettest month is March, with an average of of precipitation, and the driest is July, with of precipitation.

Watershed

The watershed covers, of which, or 15.85%, were cultivated as of 2000.
Parts of the marshes of the Rugusye, the Rumpungwe and the Malagarazi are the only mineral marshes in Burundi that are permanently flooded.
Two development projects were underway in 2000 led by SOSUMO and the Ruyigi DPAE.
These involved creating irrigation and drainage networks separated by dikes or tracks.