The solution for Australia is much simpler. Although the interior is large, it's almost uninhabited. The vast majority of Australians live on the eastern and south-eastern seaboard, dominated by one large river system (the Murray-Darling). There's plenty of room - 25 000 km of coastline (we use about half of it), for 25 million people. Apart from small island states, we are probably the most coastal nation of any significance.
The solution for Australia is much simpler. Although the interior is large, it's almost uninhabited. The vast majority of Australians live on the eastern and south-eastern seaboard, dominated by one large river system (the Murray-Darling). There's plenty of room - 25 000 km of coastline (we use about half of it), for 25 million people. Apart from small island states, we are probably the most coastal nation of any significance.