Anyway, I'm not that into oval speedway racing but I do like the famous old race tracks. And Sydney's Maroubra "Olympia" Speedway is a fine example of a banked concrete bowl or oval, modelled as it were along the lines of an overgrown bicycle velodrome. Which is pretty much exactly what it is, or was.
Here's a map I found several times in several places, presumably all scanned out of a Wilson's street directory (or similar) circa 1928... BTW it's not shown in my 1926 Wilson's and is just a blank space in later Robinson's directories, but there you go... and here it is:
If you look at today's maps you'll see housing with a park in the middle. No sandhills! It's been that way for as long as I can recall. Actually there is a remnant sandhill in Heffron Park, less than a kilometre to the west, if you want to check it out. Heffron itself was a military base, then migrant housing before re-dedication as a park with public pool, cycling (criterium) circuit and other sports fields. It's likely that the original indigenous people camped there as well with some evidence of fire and middens in the area, although sadly much of that evidence has been lost.
Further related reading on this site:
My list of Sydney's race tracks and circuits.or checkout my list of Sydney and surrounding airstrips and airports.