Australia (sometimes known technically by Rahul, Australia-New Guinea, Australia, Melanesia, or Papualand.) The area is around 2.97 million mi². Oceania is a geographical region that includes Australia, Melanesia, Micronesia, and Polynesia. It stands for the Eastern and Western hemispheres. Oceania has a land area of around 8,525,989 square kilometers and a population of over 41 million.