This popular month-long relay returns for its fourth year as aquatic Londoners on Stand Up Paddle Boards pass the baton - a bottle filled with fresh Thames water at source - from Kemble, Gloucestershire to Southend. As the different groups travel the length of the Thames there will be various events, clean ups and taster sessions along the route.
Fancy getting involved with more Totally Thames events? Check out our roundup of the best.