The district It borders at the South with Ngororero District, at the West with the Rubavu District, at the East with the Gakenke District and at the North with the Musanze District and the Democratic Republic of the Congo. Despite heavy precipitations, the area really suffers from the lack of water sources given a poor hydrographical network. The flow of water comes from ephemeral streams of torrential nature, such as the Susa and its tributary streams. The very strong slope upstream explains the fact that they are torrential. The volcano sloping flanks have an average slope of more than 60%, over 2 200 m. When it rains, the water is raced down the flanks at high speed towards the piedmont, hauling everything in its way: animals, men, lava blocks, etc. The water from the numerous torrents racing down the slopes causes a lot of damages (flooding, sanding and sapping of banks). The water bodies are supposedly numerous and the water is abundant, but those bodies are approximately at a depth of 100 m. We suppose that they are located in old depression of the basement (synclines and pockmarks) covered by lava