These are not water holes you can see but clay pans. After heavy rain they would have water in them but after the water dries up, they are just flat areas of clay that don't support ant vegetation.
@cejaanderson@888rachel When you are running a cattle station of 24,000 sq kms, I think the last thing on your mind would be making a couple of flower vases.
I suspect they do still have some moisture in them.