Why do most Australians live along the east coast?

The concentration of Australia's population along the east coast is primarily driven by environmental factors, specifically the availability of more reliable rainfall compared to the arid and semiarid interior.1

While the interior of the continent is characterized by extreme aridity, the eastern periphery—often referred to as the "Fertile Crescent"—offers a more favorable climate for settlement. This environmental gradient has historically influenced development, as settlement patterns shifted from the drier margins toward more intensive agricultural and livestock enterprises, such as dairy farming and market gardening, which require more consistent moisture.21

Early European colonization also played a foundational role in this distribution. Initial settlements, such as Sydney, were established in coastal areas with access to suitable harbors and water, such as Port Jackson. Over time, these coastal hubs developed into major administrative, commercial, and financial centers, further attracting population growth. Consequently, the vast majority of Australians reside in urban areas concentrated along this coastal strip, while much of the country's interior remains sparsely populated or effectively uninhabited due to its harsh, dry conditions.34561