The Okavango Delta, situated in northwest Botswana between E22.0°-E24.0° and
S18.0°-S20.5°, is the world's second largest inland wetland region. The Delta is
actually an alluvial fan and is fed mainly by the Okavango River whose catchment
lies largely in the highlands of central Angola (Fig 1). The river flows south-east
through the Caprivi Strip in eastern Namibia, before entering into Botswana as a large
river, some 200 m in width. The size of the Delta changes significantly throughout the
year - during the dry season, the Delta is approximately 7,000 km2, and more than
doubles in size to over 15,000 km^{2} during the wet season (Ramberg et al. 2006)
