Here's why:

* Barkley Tableland: This is a large plateau in Queensland, Australia. It's characterized by its flat, elevated surface and is known for its arid climate and sparse vegetation.

* Great Artesian Basin: This is a vast underground reservoir of water, not a landform itself. It's located beneath much of eastern and central Australia, including the Barkley Tableland.

So, while the Great Artesian Basin is important to the region, it's not the high plateau itself. The Barkley Tableland is the landform that fits your description.