A 40-year-old adventurer is expected to complete a 46,000-mile round-the-world journey that has taken 13 years.
Jason Lewis, from Dorset, has travelled over five continents, two oceans and a sea as he aimed to be the first to circle the globe on human power alone.
After dodging crocodiles and breaking both his legs, he has travelled up the River Thames in his pedal-powered boat.
Mr Lewis plans to catch the flood tide and carry his boat over Greenwich's Meridian Line, where the quest began.
He said: "The realisation is starting to creep up that it is all coming to an end and I will have mixed feelings when it does.
"But it feels like the right time to finish. I do want to move on but at the same time it will be the end of this thing I have been connected with for so long.
Royal welcome
"Everything I have done has been in some way connected with the expedition and I am wondering whether there will be this void when I finish."
Mr Lewis, a former cleaner from Askerswell, is expected to arrive at Trafalgar Yacht Club in his 26ft (8m) vessel named Moksha during the morning.
In pictures: Epic journey
Supporters will help carry the Devon-built Moksha over the Meridian Line ending his "Expedition 360" journey.
He will be given a royal welcome by the Duke of Gloucester - the expedition patron, who launched and named the craft in 1994.
Mr Lewis also made the trip in kayaks, mountain bikes and in-line skates.
He was 26 when he began his 46,000-mile (74,000km) journey on 12 July 1994, with his colleague, Steve Smith, who decided to leave the expedition in Hawaii in 1999.
Mr Lewis arrived in Britain at 2100 BST on Sunday, 30 September after spending a day crossing the English Channel from Calais, France, on the 16th and final leg of the trip.
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