A total of 38 young people have graduated as Southwark Young Pilgrims having successfully completed their summer course.
Presentation of certificates by Southwark Mayor Jeff Hook took place on board a pleasure boat as it sailed upstream along the borough boundary.
Southwark Young Pilgrims is a holiday tourism and history course for young people aged 14-16 years. This year's students came from Notre Dame School in St George's Road, Harris Academy Peckham and the Globe Academy.
"The people on board today have a genuine achievement," said the mayor.
A message of congratulation was sent by patron Sir Michael Caine.
Fellow patron, and former Mayor, Charlie Cherill welcomed guests and students to the 25th floating prize-giving sponsored by City Cruises.