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Expo 2012 Yeosu is being held between the headline World Expos which are staged every five years. The last, in Shanghai in 2010, was an elaborate affair that raised the profile of the event, and the next will be Milan in 2015.
A total of 105 countries and 10 international organisations as well as dozens of firms will hold exhibitions under the theme of "The Living Ocean and Coast".
The 250,000-square-metre (2.69 million square feet) site houses pavilions, a giant aquarium, a pair of abandoned cement silos turned into a Sky Tower and a huge circular structure -- "The Big-O" -- for light shows over the sea.