The Caprivi Region in Namibia is a narrow strip of land extending eastwards from the northeastern corner of the country, and is bordered by Angola and Zambia to the north, Botswana to the south and Zimbabwe to the east (Figure 1). The region is flat and characterised by numerous swamps and slow-flowing rivers (Mackenzie, 1946; Seaman et al., 1978). A major swamp system is centred on Lake Liambezi (Figure 1). This lake receives water from several sources (van der Waal, 1976). To the west, the Kwando River originates in the Angolan Highlands and forms the boundary between Angola and Zambia. Passing through the Caprivi Strip, the Kwando then percolates through the Linyanti swamps on the Namibia-Botswana border before feeding into Lake Liambezi. Rainfall and run-off from the area to the north of the lake also feed the lake. Floodwaters from the Zambezi enter the lake from the east during high flood years from two directions. The Chobe River reverses flow direction annually when the Zambezi floods and enters the lake from the southeast, while the Bukalo channel enters the northeast of the lake from the Caprivi floodplain. Outflow from the lake via the Chobe River when floodwaters recede is intermittent and dependent on lake level.