Melbourne, the southernmost state capital of the Australian mainland, was established by Europeans a couple hundred years ago at the juncture of a great river and a wind-whipped bay. Port Phillip Bay sprawls over 750 square miles, providing feeding grounds for whales and sheltering coastlines for brine-scented beach towns. But it’s an exceptionally shallow waterway, less than 30 feet in most places. It’s so shallow that 10,000 years ago, when ice sheets and glaciers held far more of the planet’s water than is the case today, most of the bay floor was high and dry and grazed upon by kangaroos.
Image: Tim J Keegan/Flickr
