The stretch of the River Thames between Mortlake and Putney in London, England is a well-established course for rowing races, most famously the Oxford and Cambridge Boat Race. It is often referred to as The Championship Course. The course is on the tidal reaches of the river often referred to as the Tideway.
See the Wikipedia page [1] - which has lists of landmarks, events and rowing clubs. The Boat Race page is [2].