Why was multilingualism common among Aboriginal communities in Australia?

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Distinctive features of Australia's Indigenous languages — Australian Aboriginal languages A discussion of the languages of Indigenous Australians.

Multilingualism was common among Aboriginal communities in Australia, particularly in densely populated coastal and subcoastal areas, because language boundaries were not tied to political organization. Instead, these regions were characterized by complex, overlapping kinship and marriage networks that crosscut linguistic divisions.1

While language boundaries were generally sharp in these areas, the social structure necessitated interaction across different groups, facilitating the acquisition of multiple languages. In contrast, thinly populated regions like the Great Sandy Desert were often defined by chains of closely related dialects rather than distinct, separate languages.1