Head of the River Race only open to men's eights and is considered to be the peak of the head race season — attracting the top UK crews as well as foreign clubs. Composite crews, drawn from more than one club or institution, are not permitted. The Championship Course is that of the Oxford and Cambridge Boat Race but, unlike the Boat Race, the Head of the River Race is raced on an ebb tide from Mortlake to Putney. The starting time for the race is different every year and depends on the tide — the first crew (winner from the previous year) starts the
Head of the River Race Head of the River Race The Head of the River Race (HORR) is an against-the-clock ('processional') rowing race held annually on the River Thames in London, England between eights, other such races being the Schools' Head of the River Race, Women's Head of the River Race and Veterans' Head of the River Race. Its competitors are, with a few experienced junior exceptions, seniors of UK or overseas competitors and it runs with the ebb tide down the 4.25 mile (6.8 km) Championship Course from Mortlake to Putney which hosts the Oxford and Cambridge head-to-head races usually between one and two