Lake N'gami is situated nearly in the centre of the desert, to which two of the most important northern rivers, Cubango and Quito, flow, uniting in one, the Tonga, which enters the lake at the north-west corner in 20 degrees 25 minutes South latitude, 24 degrees 45 minutes East longitude, at an altitude of 2813 feet above sea-level. The Cubango or Okavango river, the source of which is much farther north than my explorations extended, passes through a dense and impenetrable bush, extending on both banks far away in 15 degrees South latitude, where there are several tributaries falling in. Following the stream, which is broad and in many places deep, with rapids and waterfalls at different points, passing through forest and open country with native kraals situated on its left banks, occupied by various tribes who are great fishermen and have canoes, and where the hippopotami and crocodile abound, down to where the Quito enters it in 17 degrees 10 minutes South latitude, on to Debabe, a large native station, where the river turns south, branching off into the Chobe and Zambese. The other branch takes its course to Lake N'gami, and receives the Okayanka, which rises in Ovampoland and flows east. All to the north of this river the country varies much in character; the eastern portion is low with extensive swamps covered with bush and fine timber, the western portion rises in ridges with lofty plateaux covered with rich tropical plants and trees, including the giant baobab; there are also extensive plains, with dry watercourses crossing them towards the east; many of them have separate names under the general name Omuramba. The country to the west of the upper part of the Cubango, which is also called the Okavango, is rich in timber and fine grasses, and game of every description known in South Central Africa; this region is known as Ombango, through which a road passes to the Cubango, and to the north is the land of the Ambuelas, where the tsetse-fly is very common; it is inhabited by the Kasaka and Ombango Bushmen. At the bend of the river, at 16 degrees 20 minutes South latitude, the country rises in ridges towards the north considerably, causing many rapids to be formed in the stream. Below, the country is more level, until my station is reached, where there is a hill on the right of the river, with many wherfs of Bushmen, the altitude being 3370 feet above sea-level, and on the opposite side of the river are many wherfs of the Ovampo, Karakeri, Kororo, Ojego, and others, each with their separate chiefs; the most important is the Ovakuenyami. The river contains many varieties of fish, which the natives are very expert in catching from their canoes by spearing and setting traps, as also the hippopotami and crocodile.