It is on the rugged mountainous terrain between the two famous deserts – the Kalahari in the east and the Namib in the west. Around Grünau there are grassy plains – therefore Grünau’s name –green pastures. A Spectacular sight when the region had a good rainy season and you are surrounded by grass and in between “driedoringbossies”.
From Grünau you can see the two ranges that make up the Karas Mountains. These mountains are landmarks in southern Namibia, where they stand proudly above the rather flat surrounding terrain. The mountains consist of uplifted blocks of sandstone, limestones and shales.
Grünau is situated in the Gamchab Basin. This large basin was formed by rivers eroding away the terrain to the north of the Orange River. These rivers flow and erode the landscape only sporadically after heavy falls of rain. The landscape is dominated by large, open valleys of gently sloping ground covered with a sparse layer of grass. There are many prominent dolerite sills in die Basin. The landscape is named after the Gamchab River, the largest of several rivers that drain the basin. The Gamchab seldom has water and joins the Orange River west of Aussenkehr.