Annual 21-mile race on the Thames from Greenwich to Twickenham featuring approximately 300 craft.
Any traditional-style, coxed boat, propelled by a minimum of four oars or paddles, without sliding seats or riggers, may take part.
Each boat is computer-handicapped according to its potential performance, so everyone has an equal chance in this 'slowest away first, fastest last' handicap race.
Every year brings a new and unusual boat to test the handicappers.
There will be disruption to Thames Clippers boat services whilst the race is under way.
For the latest local news and events direct to your inbox every Monday, you need our weekly email newsletter SE1 Direct.
7,000+ locals read it every week. Can you afford to miss out?
Read the latest issue before signing up