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The main rivers are the Ruzizi, Malagarasi, and Ruvuvu, none of which are navigable. Dominating the south and west of the country, Lake Tanganyika is shared by Burundi, the DRC, and Tanzania. In the northeast Lake Cohoha and Lake Rugwero straddle the border with Rwanda. Water from the Malagarasi and Ruzizi rivers is used for irrigation in the extreme eastern and extreme western lowlands.Savanna vegetation (grassland interspersed with trees) predominates in most of the country. Eucalyptus, acacia, and oil palm are the most common trees. Forests, once extensive, are now concentrated in national parks and nature reserves. The diverse wildlife is limited by dense human settlement and includes elephants, leopards, hippopotamuses, crocodiles, wild boars, antelope, monkeys, and flying lemurs. Birds, such as guinea hens, partridges, ducks, geese, quail, and snipe, are particularly plentiful around the northeastern lakes.Arable land and land used for permanent crops account for 43 percent of Burundi’s land area. Another 4 percent is covered by forest. The principal mineral resources are peat, uranium, nickel, petroleum, tin, bastnasite, and gold.