Lac Louis is an egg-shaped lake in Quebec, Canada that was site of the professional marathon swim relay, 24 Heures La Tuque. Lac Louis was site of the 24-hour 2-person professional marathon swimming relay held in the 1960's and 1970's.
24 Heures La Tuque
24 Heures La Tuque was a non-stop relay with up to 20 two-person teams that ran from 3 p.m. Saturday to 3 p.m. Sunday. The course was a one-third of a mile plus 11 feet that paralleled the shore so crowds of thousands cheered on the professional marathon swimmers day and night. Some of the greatest marathon swimmers of that era competed in the race.