Termite Mounds occur when an aboveground nest grows beyond its initially concealing surface.
Two to three metres, however, would be typical for the largest mounds in most savannas.
The sculptured mounds sometimes have elaborate and distinctive forms. This orientation has been experimentally shown to assist thermoregulation. The thin end of the nest faces towards the sun at its peak intensity hence taking up the least possible heat, this allows these termites to stay above ground where other species are forced to move into deeper below ground areas.
The column of hot air rising in the aboveground mounds helps drive air circulation currents inside the subterranean network. The structure of these mounds can be quite complex. The temperature control is essential for those species that cultivate fungal gardens and even for those that don't, much effort and energy is spent maintaining the brood within a narrow temperature range, often only plus or minus 1 degree C over a day.