A group of young people took on a fundraising walk from Tring to Hemel Hempstead and back again along the Grand Union Canal.
The walkers, aged 16 and 17, were raising money for the Attacking Trafficking Foundation which combats human trafficking.
They are enrolled in the Cabinet Office’s National Citizens Service to get young people involved in socially useful schemes.
They plan to run 27 events in the area in the next few weeks. Deputy mayor of Tring Nick Hollinghurst set them on their way on Thursday.
He said: “It was really inspiring to meet a group like this coming together from a numbers of different towns and backgrounds.
“When you meet keen and lively young people like these, it really gives you hope and confidence for the future of Britain.”