Central Kalahari Game Reserve
The Central Kalahari Game Reserve CKGR (sometimes spelt Kgalagadi) is a huge area, which requires a permit (i.e. paying an entrance permit) to enter. Do not expect it to be a "classical" desert (orange sand dunes etc), but rather a huge area with differing terrain, ranging from thick bush, thorny trees and plain salt pans and so on.
In the summer months it can get extremely hot, so always make sure you have plenty of water with you (at least 10litres per person per day). The same goes for petrol/diesel, so stock up before going there.
Lions, hyenas, antelopes and various birds and smaller mammals are often found in the reserve.
When entering via Matswere Gate (about 40km from the small city of Rakops), the dirt roads in the area are well marked, and having enough clearance with your 4x4 easily navigable. The way between the Matswere Gate and Rakops is easy to be found and followed, and after some 10km after having left the tar road near Rakops, the dirty road is easy to drive on (provided a 4x4 is driven).
The Kalahari reserve has several campsites, some of which are run by the Government (around Pula 30,00 per person per night), some are now run by private enterprises and up to 10 times (!) more expensive. Still, they are all (Government and privately run camp sites) very basic to say the least, with a long drop toilet at best, no running water and only at some you can find a bucket shower (still have to provide your own water for that). Usually, the campsite are referred to by abbreviations, for instance SUNCR01 (just an example!), so make sure you are going and staying at the right campsite.
Do not litter, please take all refuse back with you when camping.
At the Matwere gate you get a free map, which is decent enough and has several GPS coordinates for easier navigation.
Many 4x4 and traveling forums (often South African websites) have the latest and most detailed information on the reserve, so check with them before you go.