Port Jackson or Sydney Harbour, inlet of the Pacific Ocean, 22 sq mi (57 sq km), 12 mi (19 km) long and 1.5 mi (2.4 km) wide at its mouth, New South Wales, Australia, forming Australia's finest harbor. The Parramatta River forms its western arm. Sydney on the south shore is connected with its northern suburbs by Sydney Harbour Bridge (1932), the second longest steel-arch bridge in the world, with an arch span of 1,650 ft (503 m).
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