Here is a brief summary of the major landforms in Australia, taken from the World Atlas. This gives a list of the main ones with a short description of each.
Ayers Rock - After kangaroos, this is probably the most significant natural icon of the "Land Down Under". Considered the largest solitary rock on the planet, it stands 1,143 feet high and can be seen for miles.
Cape York Peninsula - Home to jagged-tooth mountains, rainforest, swamps, and grasslands, it is considered the world's "last wilderness."
Fraser Island - Australia's fourth largest island, and the largest sand island on earth.
Great Dividing Range - Located along the eastern and southeastern portion of Australia, this mountain range divides the central dry regions from the coastal areas. Mount Kosciusko, the highest point in Australia is located in these mountains (Australian Alps). Also in the Great Dividing Range are the Blue Mountains, one of the most beautiful locations on earth, and Australia's most visited.
Great Sandy Desert - Located in western Australia, this dry, arid expanse of land received little rain, and few visitors. This desert is famous for its red sand dunes.
Darling/Murray River System - 1160 miles in length, the Darling river is the longest river in Australia and joins with the Murray River, the widest. It begins in the Australian Alps, and flows into the Spencer Gulf.
Great Barrier Reef - The World's largest coral deposit. Famous for its breath-taking beauty, and vast variety of wildlife.
If you wnat to read more about the major landforms of Australia, visit the site below -
http://www.worldatlas.com/webimage/countrys/oceania/aussnewld.htm