The Boat Race course, known as the Championship Course is 4 miles, 374 yards or 6.8 Km long. It stretches between Putney and Mortlake on the River Thames in South West London.
This course was first used for the Boat Race in 1845 and has been used for every race since, (apart from 1846, 1856 and 1863 when the race was held in the opposite direction between Mortlake and Putney).
The Fulham/Chiswick side of the course is known as the Middlesex side. The Putney/Barnes side of the course is known as the Surrey side.
The Boat Races are rowed upstream, but are timed to start on the incoming flood tide. The Boat Race is usually an hour before high tide, with the Women's Boat Race a further hour before so that the crews are rowing with the fastest possible current.