LONDON (Sky News) -- The Olympic torch has completed the final leg of its 70-day journey around the UK ahead of the much-anticipated opening ceremony of the London 2012 Games.
Crowds gathered to watch the flame make its way along the River Thames from Hampton Court to Tower Bridge on the royal barge Gloriana.
Later the torch, which has been seen by millions on its 8,000-mile journey, will be carried into the Olympic Stadium and the flame lit by a mystery VIP.
The £1m Gloriana, powered by 16 oarsmen, transported the flame downriver in a cauldron, lit by four-time Olympic gold medal-winning rower Matthew Pinsent.
It was accompanied by a flotilla of more than 50 boats as it snaked its way along the river.
Over the course of the route, the flame was borne by seven young torchbearers.
The last torchbearer of the day was 22-year-old Amber Charles from Newham, east London, who delivered London's Olympic bid in 2004.
She carried the flame to Tower Bridge before it was taken to City Hall, where it will remain out of public view until the opening ceremony begins.
Mystery still surrounds who will be given the honour of lighting the Olympic flame at the £27m extravaganza, directed by Danny Boyle.
Sir Steve Redgrave, Sir Roger Bannister, Daley Thompson, David Beckham and even the Queen have all been touted as contenders, but organisers have managed to keep it secret.
Games chief Lord Coe said: "Support for the torchbearers has been immense with over 13 million people lining the streets across the UK to cheer them on.
"Thank you to each and every person for giving the Olympic Flame such a magnificent welcome and celebrating the best of the UK with us.
"Together we have given the London 2012 Games the best possible start and we are delighted to have seven inspiring young people carrying the flame on the last leg of the Olympic Torch Relay."
Mayor of London Boris Johnson said: "From Wandsworth to Enfield and Bromley to Harrow, over three million Londoners have lined the streets of the capital to cheer on the flame and our inspirational torchbearers.
"As excitement builds to a crescendo ahead of what promises to be a glorious Opening Ceremony, London is poised and ready for a fantastic Games."
The torch was lit in Greece's ancient Olympia on May 10 and has since been carried by a host of people from local heroes to sporting greats and celebrities.
On Thursday it was welcomed at Buckingham Palace by the Duke and Duchess of Cambridge and Prince Harry.