Inlet of the South Pacific Ocean, southeastern Australia.
Lying south of Sydney off Port Jackson, it is about 6 mi (10 km) at its widest. It was the scene of the first Australian landing by Capt. James Cook in 1770; he named the bay for its great variety of plants. It was selected in 1787 as the site for a penal settlement, but the settlement was soon transferred inland. Its shores are now ringed by Sydney's suburbs.