Sydney harbour is 12 miles (19 km) long with a total area of 21 square miles (55 square km) . It has minimum and maximum depths of 30 feet (9 metres) and 155 feet at low water, and its irregular foreshores extend more than 150 miles
http://www.britannica.com/EBchecked/topic/470897/Port-Jackson
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Sydney is larger. According to the June 2007 estimated population figures, Sydney's population stood at 4,336,374 whilst Melbourne's was 3,806,092.