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.
Related website: www.greatriverrace.co.uk