There are three large elevated areas in Northern Australia, the Kimberleys in WA, Arnhem Land in the NT and the area SW of Cairns in Qld.
I used this map when I was looking for an elevated area in North Qld for this trip in 8/2008.
http://www.jpl.nasa.gov/wallpaper/ar...-1600x1200.jpg
There are more wallpapers at:
http://www.jpl.nasa.gov/wallpaper/earth.cfm