Thanks Walter Glover and Mick Fagan. it's the Wooli River near Minnie Water in northern NSW. Modern (politically correct?) usage has it as the Wooli Wooli River.
Photographing outdoors with a heavy-metal 8x10 studio monorail camera like the Plaubel Profia is a pleasure. All the camera movements are precise, smooth, and stable and image quality is pretty well guaranteed. But lugging the darn thing, and the hefty tripod to hold it up, is a chore. Since the camera does not go in a backpack I was reduced to carrying it by hand via the monorail and grounding it upside down on the four standard support posts when I needed a rest.