A bottle filled with water from near the Thames source is making its way downstream as part of the Totally Thames programme.
Totally Thames is the rebranded and much extended annual Thames Festival.
The journey started last Sunday 17 August.
This bank holiday weekend 23-25 August the bottle travels from Benson Lock to Henley.
On Saturday swimmers are taking the bottle from Benson to Goring.
On Sunday rowers are responsible for getting the bottle to Caversham.
On Bank Holiday Monday it’s in the hands of traditional boat owners who will deliver the bottle to the River & Rowing Museum for safekeeping overnight.
The bottle reaches London at the end of the month.