Record-breaking mountaineer Alan Hinkes is attempting to climb the six highest peaks in the British Isles in just 72 hours to raise money for charity.
Alan Hinkes said he was excited by the challenge
The former teacher from North Yorkshire became the first Briton to scale the world's 14 highest peaks last year.
He began leading a team in the Six Peaks Challenge to raise more than £100,000 for WaterAid on Friday.
The three-day event involves two sea crossings, walking 50 miles, driving 1,000 miles and climbing 20,000ft.
The team set off from the Isle of Man and hope to finish in the Republic of Ireland on Monday after climbing the highest mountains in Wales, England, Scotland and Northern Ireland along the way.
The six peaks in the challenge
Snaefell on the Isle of Man
Snowdon in Wales
Scafell Pike in the Lake District
Ben Nevis in Scotland
Slieve Donard in Northern Ireland
Corran Tuathail in the Republic of Ireland
Mr Hinkes, of Northallerton, said he was excited by the challenge as it included peaks, such as Snaefell on the Isle of Man, that he had never climbed before.
"This is a fantastic way for people to see some of the most spectacular sights of the British Isles," he said.
"Reaching the summit of these mountains will be a huge personal challenge for many of the teams taking part."
Any money raised will be used by WaterAid to provide safe water for the world's poorest people.
He became only the thirteenth person to conquer all mountains over a height of 8,000m when he reached the summit of Kangchenjunga in Nepal in June 2005.