The Queen and the Duke of Edinburgh will end their regional Diamond Jubilee tour of the UK by visiting the Isle of Wight and the New Forest.
The royal party will arrive in Cowes aboard the ship Leander through a parade of sail featuring a series of superyachts before being greeted with a 21-gun salute.
A plaque marking their visit will then be unveiled before they view a performance by local schoolchildren and move on to the RNLI lifeboat station which the Queen will officially open.
After launching the new RNLI lifeboat, the Queen and Philip will view presentations by marine groups at Cowes Yacht Haven before leaving by helicopter for Hampshire.
At the New Forest Agricultural Showground, they will be met by television presenter and show society president Alan Titchmarsh and they will tour the showground, starting with the blacksmith area.
After lunch, the Queen and Philip will view livestock and local produce, visit a show farm and present prizes before leaving the showground.
Before the visit, the Lord-Lieutenant of the Isle of Wight, Major-General Martin White, said: "It is a great honour to be welcoming Her Majesty to the island on the final day of her Diamond Jubilee tour.
"I am looking forward to introducing the Queen and Duke of Edinburgh to individuals and organisations that make valuable contributions to island life and I know, come rain or shine, islanders will give Her Majesty the warmest welcome on Wednesday."
The visit brings the curtain down on the four-month Diamond Jubilee tour, which has seen the Queen and Philip travel the length and breadth of the UK. The visits to towns and cities across the country were organised to thank the British public in the 60th year of her reign.
The tour started in March in Leicester and took in every corner of the UK, during which they travelled by a range of means - car, royal train, aircraft and ship.