The geology in Namibia is one of the most interesting in the world. The rock formations allow a view into a history of the earth, from ongoing weathering and erosion. Interesting rocks and beautiful landscapes are evidence of all imaginable climatic extremes, previous mountain building processes, volcanic eruptions, sea level changes and the collision of whole continents.
On GocheGanas, quartzites, which are weathering resistant, are found on the mountains of GocheGanas and occur as ridges. In places you can see interesting folded structures within these layers, which are due to the forces of mountain building. Much of the area consists of the softer mica-shist.
The visible banding of dark and light layers in the rock is caused by varying amounts of different minerals. The dark layers are mainly clay and mica minerals, while the lighter sections consist of quartz. The Usib River, originating from the Auas Mountains, winds its way through the grassy flood plains of GocheGanas on its path through Nauas Poort and Rehoboth. Altitude: The height above sea level varies between 1,714 - 2,211m.
Highland Savanna (Bergthorn Savanna), this veld type characterizes the central, mountainous areas of the territory and covers the farm GocheGanas. Typical trees found on Gocheganas are species like the mountain thorn (Acacia hereroensis), candle-pod acacia (Acacia hebeclada subsp. hebeclada), black hook thorn (Acacia millifera subsp. detinens), Kudubush (Combretum apiculatum subsp. apiculatum), wild pear (Dombeya rotundifolia), worm-cure albizia (Albizia anthelmintica) and the shepherd's tree (Boscia albitrunca).
Along the dry riverbeds the camelthorn (Acacia erioloba), karee (rhus lancea), buffalo thorn (Ziziphus mucronata) and sweet thorn (Acacia karroo) occur. Common shrubs are the gabba-bush (Cataphractes alexandri), brandy bush (Grewia flava), the Camphor bush (Tarchonanthus camphorates) and the looiwortelbos (Elephantorrhiza suffruticosa).
Some valuable climax grasses, which occur here, are wool grass (Anthephora pubescens), black-footed brachiaria (Brachiaria nigropedata) and finger grass (Digitaria eriantha).
The average rainfall at GocheGanas Nature Reserve is 366 mm per year with temperatures ranging from a minimum of 3,9° C to a maximum of 38,1° C. The average humidity is 34%, and the evaporation 3.388 mm per year.