On the map, it's marked as Batoota Lake, and Batoota is apparently a ghost town in Australia, not just a funny word. The masterpiece of sketching (you can't help but admire the confidence of line here) was made using a dry lakebed for a canvas, according to the Geelong Advertiser. It's unclear at this time what implement was used to make the implement.
It's also important to note that the location has received many five-star reviews accompanied by thoughtful commentary like "Great to see such a firm Australian erection" and "pretty good size. (of lake).”
But it's unlikely we'll ever know for sure who made this etching.
(It was aliens.)