Which large bay on Australia's south coast is known for its limestone cliffs?

The large bay on Australia's south coast known for its limestone cliffs is the Great Australian Bight.

The Bight is a broad oceanic indentation stretching along the southern coast of mainland Australia. Much of its northern shoreline borders the Nullarbor Plain, a remarkably flat limestone landscape. Where the uplifted limestone plateau meets the sea, it forms dramatic escarpments including the Bunda Cliffs, which rise to roughly 60 metres and extend for more than 200 kilometres.

The Great Australian Bight was first encountered by European explorers in 1627 and was accurately charted by Matthew Flinders in 1802. Geologically, it developed about 50 million years ago as Gondwana split and Australia separated from Antarctica.

A common mix-up is treating the Bight as a specific cliff formation. Bunda Cliffs and Baxter Cliffs are sections of the coastline; the Great Australian Bight is the much larger body of water. Its waters also support southern right whales, Australian sea lions and productive seasonal upwelling zones.