Shark Bay, Australia

SHARK BAY (Australia)

Shark Bay and its islands are at the westernmost point of the Australian continent, about 500 miles north of Perth. The vast sea-grass beds are the largest and richest in the world, and home to 10,000 or so dugongs ("sea cows"), about 1/8 of the world's population. And its stromatolites (hard deposits formed by colonies of algae) are among the oldest lifeforms on earth.

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(Image courtesy Wikimedia Commons; CTTO)