290,587 sq mi it is the 38th-largest country in the world, slightly smaller than Turkey. The country lies mostly between latitudes 8° and 18°S, and longitudes 22° and 34°E. Zambia is drained by two major river basins: the Zambezi/Kafue basin in the center, west, and south covering about three-quarters of the country; and the Congo basin in the north covering about one-quarter of the country. A very small area in the northeast forms part of the internal drainage basin of Lake Rukwa in Tanzania. In the Zambezi basin, there are a number of major rivers flowing wholly or partially through Zambia: the Kabompo, Lungwebungu, Kafue, Luangwa, and the Zambezi itself, which flows through the country in the west and then forms its southern border with Namibia, Botswana and Zimbabwe. Its source is in Zambia but it diverts into Angola, and a number of its tributaries rise in Angola's central highlands. The edge of the Cuando River floodplain (not its main channel) forms Zambia's southwestern border, and via the Chobe River that river contributes very little water to the Zambezi because most are lost by evaporation. Two of the Zambezi's longest and largest tributaries, the Kafue and the Luangwa, flow mainly in Zambia. Their confluences with the Zambezi are on the border with Zimbabwe at Chirundu and Luangwa town respectively. Before its confluence, the Luangwa River forms part of Zambia's border with Mozambique. From Luangwa town, the Zambezi leaves Zambia and flows into Mozambique, and eventually into the Mozambique Channel. The Zambezi falls about over the Victoria Falls, located in the southwest corner of the country, subsequently flowing into Lake Kariba. The Zambezi valley, running along the southern border, is both deep and wide. From Lake Kariba going east, it is formed by grabens and like the Luangwa, Mweru-Luapula, Mweru-wa-Ntipa and Lake Tanganyika valleys, is a rift valley. The north of Zambia is very flat with broad plains. In the west the most notable being the Barotse Floodplain on the Zambezi, which floods from December to June, lagging behind the annual rainy season (typically November to April). The flood dominates the natural environment and the lives, society, and culture of the inhabitants and those of other smaller, floodplains throughout the country. In Eastern Zambia the plateau which extends between the Zambezi and Lake Tanganyika valleys is tilted upwards to the north, and so rises imperceptibly from about in the south to