Most of Rwanda is a region of savanna grassland. There is little forest left; the country is one of the most eroded and deforested in all of tropical Africa. Remaining woodlands are small areas of tropical forests along the western border, north and south of Lake Kivu. The most common trees are eucalyptus—imported from the south in the 1890s—acacias, and oil palms.
Wildlife was abundant before the region became agricultural. There are still elephants, hippopotamuses, buffalo, cheetahs, lions, zebras, leopards, monkeys, gorillas, jackals, hyena, wild boar, antelope, flying lemurs, crocodiles, guinea hens, partridges, ducks, geese, quail, and snipe. Because the region is densely populated, these are becoming fewer, and some species are disappearing.