Thames Diamond Jubilee Pageant

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The Thames Diamond Jubilee Pageant was a parade on 3rd June 2012 of 670 boats on the Tideway of the River Thames in London as part of the celebrations of the Diamond Jubilee of Queen Elizabeth Ⅱ. The Queen, Prince Philip and other members of the Royal Family were aboard vessels that took part in the parade.
The vessels that took part included military, commercial, and pleasure craft. According to Guinness World Records, this was the largest ever parade of boats, surpassing the previous record of 327 vessels set in Bremerhaven, Germany, in 2011. Sailing vessels and others too tall to pass under the bridges were moored as an “Avenue of Sail” downstream of London Bridge with smaller craft in St Katherine Docks.
The pageant was planned with inspiration from a painting by the 18th century Venetian painter, Canaletto. The painting Lord Mayor’s Day on the Thames depicts a flotilla against a background of London, including St Paul’s Cathedral.
https://en.wikipedia.org/wiki/Thames_Diamond_Jubilee_Pageant