Next year will mark the Queen's Diamond Jubilee.
And the monarch intends to celebrate her 60 years on the throne in style, leading a flotilla of 1,000 boats along the Thames in June 2012.
The flotilla – the largest ever to be assembled on the Thames – will begin in Putney at 2.30pm and arrive at Tower Bride 90 minutes later.
London Mayor Boris Johnson spoke to reporters at City Hall about his delight over the event.
"I cannot conceive of a more fitting celebration of Her Majesty's 60 years on the throne than a majestic flotilla of vessels winding their way along the iconic River Thames and showcasing our proud maritime history," he said.
Fireworks, music and special effects will accompany the seven-and-a-half-mile long flotilla as it ebbs its way downstream.
Royal commentator Dickie Arbiter has also voiced his approval: "Using the Thames as a focal point… is fantastic.
"You can get a million people outside Buckingham Palace, but they would stretch back as far as Trafalgar Square.
"This way everyone will have a great view of the Queen's barge."
Photo: © Rex