The swamps are full of huge reeds, bordered with tamarisk jungles, and in its lower reaches, where the water stretches out into great marshes, the river is clogged with a growth of agrostis.
Put comprehensively, it involves the control of the subsoil and surface waters by drainage, the regulation of rivers and floods, suitable agriculture, the clearing of forests or jungles, which tend to increase the rainfall and keep the ground swampy.
Behind the luxuriant jungles of the sub-tropical coast, once over the main range, we find the purely Australian flora with its apparent sameness and sombre dulness.
By far the larger part of the valley is quite uncultivated, and much of it is occupied by tamarisk jungles, the home of countless wild pigs.
Hyenas, jackals, wild pig, polecats and wild dogs (Canis pictus) of different species are still found in or about bush jungles and forest clumps; elands (Antilope oreas) are preserved on some estates, and there are at least ten distinct species of antelope (hartebeest, bushbok, duiker, rietbok, rhebok, rovibok, blauwbok, &c.).