The most populated region of Australia is the southeastern coast because drops grow much better there and the vast majority of Australia is desert.
Answer:
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For number 17, the city with the highest polulation density is Tokyo. Most of Japan's people live there.
It would have effects on humans because it would Create widespread beach and cliff erosion, damaging coastal property and infrastructure. Make flood insurance unaffordable and unviable. Lead to salt-water intrusion in coastal aquifers, accelerating corrosion of waste- and storm-water drainage systems and affecting water quality and water resources.