The Liffey Swim, currently titled the Jones Engineering Dublin City Liffey Swim, is an annual race in Dublin's main river, the Liffey, and is one of Ireland's most famous traditional sporting events. The race is managed by a voluntary not-for-profit organisation, Leinster Open Sea. The 100th Liffey Swim over a 2.2 km course took place on Saturday 3 August 2019, starting at the Rory O’More Bridge (Watling Street Bridge) beside the Guinness Brewery and finishing at North Wall Quay in front of the Customs House.