The Ruhwa River (or Lua, Luha, Luhwa, Luwa, Ruwa) is a river in southwestern Rwanda that is a left-hand tributary of the Ruzizi River.

It joins the Ruzizi, which forms the boundary between Rwanda and the Democratic Republic of the Congo, about 2 kilometres (1.2 mi) below the point where the Rubyiro River enters the Ruzizi.

The Ruhwa forms the boundary between the western regions of Rwanda and Burundi.

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