Hey there! I'm happy to help!
For a place to be densely populated, you have to have a small land area and lots of people. Usually very small areas are very densely populated. The smallest territory in Australia is Australian Capital Territory (Canberra). It is just the Australian capital, so it is a small territory and there are definitely lots of people living near the capital, so we have ticked small area and lots of people off our list to have it be densely populate, so this territory is the most densely populated Australian territory.
Have a wonderful day! :D
