Diamond Head, Oahu, Hawaii is the name of a volcanic tuff cone on the Hawaiian island of O'ahu. Its English name was given by British sailors in the century, who mistook calcite crystals on the adjacent beach for diamonds. Hawaii is the state.
Sydney is the state capital of New South Wales and the most populous city in Australia. It is on Australia's south-east coast, on the Tasman Sea. The site of the first British colony in Australia, Sydney was established in