Rwanda is a diverse country and rich in fertile lands. The whole country is set on a relatively high altitude, the lowest point being 950 meters above sea level. Earthy swamps and sunny savannahs prevail in the east, while the center is characterized by rolling hills. The west, however, lies within the Albertine Rift montane forests ecoregion with an abundance of wildlife. Lake Kivu is the largest lake in Rwanda that marks the western border with Congo. As part of the Albertine Rift Mountains, this area is generally not as hot as the east, providing excellent coffee cultivation conditions. Volcanoes provided nutritional soils blessing the whole region with verdant slopes.