How much outback covers the world?

The term "outback" typically refers to the remote and sparsely populated regions of Australia, particularly in the interior. While there isn't a specific measurement for how much of the world is classified as outback, it primarily pertains to Australia, which covers about 7.7 million square kilometers. The concept of "outback" isn't universally applicable to other countries, though many regions globally have remote, undeveloped areas.