Korsman is a natural pan with a slight inslope towards the pan. Altitude 1632m (water level). There is no natural outlet.
Clay soils (run-off deposits) and some stony areas. Quartzite outcrops in three areas of the Sanctuary. The general underlying geology is mostly quartzite, with sandstone on the southern part.
Saturated soils, salt deserts, fluctuating water level/table. Designated a wetland.
Biome and veld type: Mesic Highveld Grassland bioregion, vegetation type region Soweto Highveld Grassland and Eastern Temperate Freshwater Wetlands (Mucina and Rutherford 2006).
Climate: Summer rainfall region. Average rainfall 722mm per annum.
Average maximum temperature 21.9ᴼC per annum. Average minimum temperature 10.1ᴼC per annum.
The pan is fed by rainfall and storm water runoff from a 220Ha catchment area.
Bathymetric map by Devon du Plessis.