Re: Re Total land area
Australia has a total land area of 7,659,861 sqkm (around 2,969,607 sqm)!!!
Australia's land area is surprisingly close to the total land area - i.e. not counting surface water, of which there's another couple hundred thousand square miles - of the contiguous United States (i.e. the contiguous 48 states plus Washington D.C.).
Obviously if you add in Hawaii and Alaska there's a bit more land area in the US. Really Hawaii is within the margin of error; Alaska adds about another 20% to the US land area.
Of course there are a lot more road miles here than in Australia. Particularly if we count the "forest roads" built and maintained by the US Forest Service, which has around 375,000 miles of them. (That's nearly 8 times as many road miles as the US Interstate system.)