The divisions on the map represent the major Indigenous Australian languages. The majority of them, in the yellow area, belong to the Pama–Nyungan language family (wiki). The large area in the central west is the Western Desert group and the area in the south west (from south of Geraldton to east of Esperance) is Noongar. For a more detailed overview of Indigenous language sub-groups or dialects see the AIATSIS map of Indigenous Australia (here).
To access what I have posted about Indigenous Australia the sidebar (which is beneath the post on mobiles) contains ‘Aboriginal’ as both a category and a tag. In general, the former discusses works by Indigenous Australians and the latter, works about Indigenous Australians by white authors.
For a comprehensive reading list see ANZLL Indigenous Literature Reading List (here)
22 Sept. 2016. A new study, published in Nature, reveals Papuan and Aboriginal ancestors left Africa around 72,000 years ago and then split from the main group around 58,000 years ago. They reached the supercontinent of ‘Sahul’ that originally united Tasmania, Australia and New Guinea around 50,000 years ago, picking up the DNA of Neanderthals, Denisovans and another extinct hominin along the way. Papuans and Aboriginals then split around 37,000 years ago, long before the continents were finally cut off from each other around 8,000 years ago. (Full story here).
15 March 2017. Patterns of Aboriginal migration and settlement revealed by DNA study (here)