The Rietvlei Nature Reserve is located in Pretoria and is about 4,000 hectares (40 km2) in size. Located within the reserve is the Rietvlei Dam. The Rietvlei Nature Reserve surrounds and include the Rietvlei dam and is situated south east of Pretoria, in the Gauteng Province of South Africa, between the R21 highway (OR Tambo Airport highway) on the western side and the R50 (Delmas / Babsfontein) road on the north-east (Figure 2.2). The site lies in the quarter degree grid square 2528CD (Rietvlei Dam), between 25º50’S and 25º56’S latitude and 28º15'E and 28º19'E longitude. The mean elevation above sea level is approximately 1 525 meters, with the highest point at 1 542 m and the lowest point at 1 473 m (at the dam’s outflow). The reserve covers a surface area of approximately 4003 ha or 40