I heard at one point during the early 1920's or 1930's (I can't remember) there was a proposal and I believe a voting referendum in which the region of New England (The one in New South Wales) to become a new state in Australia. Perhaps this is a map of it?
This is the proposal from the 1920s, the referendum was in the 1960s for a much smaller area and can be found in the pdf which @Camelopardalim screenshotted and I'd previously posed a few months ago.
If anyone is looking for more maps of proposed Australian states, this PDF has a whole bunch of them.