There are not many areas above about 1700 m, and even at Mt Kosciusko, the highest point on the continent, it is less then 3000 m above sea level.
Not high compared with the mountains in other parts of the world.
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On the east coast the short, steep rivers have not regressed as much as would be expected, some having eroded headward by about 100 km in about 60 My.
In the later Tertiary the Lake Eyre Basin began to subside, resulting in the internal (endogenetic) drainage system that drains much of inland Australia.
There are 3 major structural components, the stable Western Shield, the gently warped Central Basin, and the ancient orogony of the Eastern Uplands, which have been rejuvenated by differential uplift in Tertiary and later times.
The result is the vast plains and plateaux of the Australian landscape.
According to Twidale & Campbell, the compact shape of the Australian continent has contributed to the tendency for widespread plantation, with few major indentations or embayments along the extensive coastline.
This meant that as sea level changes occurred the resulting changes of river behaviour were limited to the margins of the continent, with the coastal rivers being the only rivers affected, the inland rivers being shielded from such impacts.In the north-west the highest ground is in the marginal line of the Hamersley, Kimberley and Arnhem Land Plateaux.The external drainage on 3 sides of the continent is restricted to a narrow strip around the edge of the continent on 3 sides totaling about 1/3 of the continental area.Any that formed were on the high country that is such a small part of the Australian landscape.After being recycled many times over much of the history of the Earth, with no new rock added by volcanism, the soils of arid Australia have been weathered and leached more than any others making them the most nutrient-deficient soils in the world.Depositional plains are also a prominent feature of inland Australia (Twidale & Campbell, Source 5).