From Bushwalk Australia
A flat geographical landform spanning a large surface area. There are a number of different types of plain. Plains can form at the bottom of valleys, in lowland areas, or on highland plateaus. Vegetation can vary from nothing (such as a total desert) to completely forested. Button grass plains are a distinctive feature of poorly drained areas in the western half of Tasmania, and are often encountered along popular walking routes in highland areas, such as the Overland Track and in the South West.