The Women's Eights Head of the River Race (WEHoRR) is a processional rowing race held annually on the Tideway of the River Thames in London on the 4 1⁄4-mile (6.8 km) Championship Course from Mortlake to Putney. A mirror of the Eights Head of the River for male crews, it is held a fortnight earlier when the tides are similar. It is raced on the outgoing tide and starting around one hour after high tide in order to maximise advantage from the tidal flow.