The Henley Royal Regatta is a rowing event held annually on the River Thames by the town of Henley-on-Thames, England. It was established on 26 March 1839. The Henley Royal Regatta is one of the most prestigious rowing events in the world. It is a celebration of amateur rowing, and it attracts the best rowers from around the globe. The regatta is also a major social event, and it is attended by celebrities, royalty, and members of the general public.