Gosses Bluff, nr. Alice Springs
Seen it from a distance on an outback tour ... not much of it left nowadaze.
http://asterweb.jpl.nasa.gov/gallery...sp?name=Gosses
"Gosses Bluff, about 205 km west of Alice Springs, in the Northern Territory, Australia, is one of the most significant impact structures in the world. This crater is thought to have been made by the impact of a large comet or meteorite, about 143 million years ago. It has been estimated that the original crater would have been about 22 km in diameter ... "
Landsat 7 image:
http://earthobservatory.nasa.gov/New...3?img_id=16503
Also:
http://www.ahc.gov.au/publications/g...il/gosses.html