There are many miles of limestone flats, some extending ten miles in length, bounded by extensive sand-dunes, and isolated koppies, with their pointed summits covered with bush. These sand-dunes cover an immense area, extending from east to west fifty miles, and thirty miles over, and in altitude from fifty to 200 feet. Their base is a dark limestone covered with sand, which varies in thickness from four to ten feet. Their sides are at an angle of about 30 degrees, and the topmost ridges so pointed that when a waggon and span of eighteen oxen arrive towards their tops, the whole span is descending on the other side as the waggon reaches the summit, and the driver on the box can only see the four after oxen; but from the great depth of sand in the road the waggon glides down with ease. To illustrate more clearly the shape of these dunes I can only compare them to a very stormy sea, with gigantic waves instantly turned into sand; many small trees and bushes grow on their slopes, and also beautiful grasses. From six to eight miles a day with an ox-waggon is considered a good trek. There are some small fountains and vleis in some of the hollows, otherwise no one could pass that way, as the road over these dunes from first entering them is thirty miles, then a flat of eight miles over limestone and sand-dunes again. There are also many isolated conical granite hills, that rise from the level plains to an altitude of 200 feet, formed of huge blocks; they more resemble artificial than natural monuments; many of them are so overgrown with trees and bush that grow between the blocks that scarcely any of the rock is to be seen. It is dangerous to inspect them too closely, as they are the lurking-places of lions, leopards, and other beasts of prey. I discovered this on ascending one of them at Kanardas: when nearly half-way up, on looking into one of the small caverns, of which there are many, I saw at the end two large bright eyes glaring at me from the dark. After exchanging a good stare at each other I quietly took my departure down: knowing the nature of these animals, that they will not openly follow or attack, if not disturbed, I felt pretty safe. As to the nature of the beast I cannot say, but from the great size of the bright red eyes I concluded he was a lion,--at any rate, their expression did not appear very amiable. A few lessons like this make an explorer cautious before prying too closely into hidden and secluded spots in a wild country like this desert.