The Republic of Uganda is a landlocked country in East Africa. It is bordered on the east by Kenya, on the north by Sudan, on the west by the Democratic Republic of the Congo, on the southwest by Rwanda, and on the south by Tanzania. The southern part of the country includes a substantial portion of Lake Victoria, within which it shares borders with Kenya and Tanzania. Uganda takes its name from the Buganda kingdom, which encompassed a portion of the south of the country including the capital Kampala. The country is located on the East African plateau, averaging about 1100 metres (3,250 ft) above sea level, and this slopes very steadily downwards to the Sudanese Plain to the North. However, much of the south is poorly drained, while the centre is dominated by Lake Kyoga, which is also surrounded by extensive marshy areas. Uganda lies almost completely within the Nile basin. The Victoria Nile drains from the lake into Lake Kyoga and thence into Lake Albert on the Congolese border . It then runs northwards into Sudan. One small area on the eastern edge of Uganda is drained by the Turkwel river, part of the internal drainage basin of Lake Turkana. Although generally equatorial, the climate is not uniform as the altitude modifies the climate. Southern Uganda is wetter with rain generally spread throughout the year. At Entebbe on the northern shore of Lake Victoria, most rain falls from March to June and the November/December period. Further to the north a dry season gradually emerges; at Gulu about 120km from the Sudanese border, November to February is much drier than the rest of the year. The north eastern Karamoja region has the driest climate and is prone to droughts in some years. Ruwenzori in the south west on the border with Congo (DRC) receives heavy rain all year round.