Traversée Internationale du lac Memphrémagog

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Petar Stoychev, a professional marathon swimmer and winner of 11 Traversée Internationale du lac Memphrémagog competitions
Amateur swimmers at the Traversée Internationale du lac Memphrémagog competition
Billy O'Connor, the first person to successfully swim across lac Memphrémagog, done in 1955

Traversée Internationale du lac Memphrémagog is a multi-race amateur open water swimming and professional marathon swimming event in Québec, Canada that is part of the FINA Open Water Swimming Grand Prix, a professional ultra-marathon swimming circuit. It is held in Lac Memphrémagog that borders the state of Vermont and Québec, Canada. It is one of the longest marathon swims in the world and one of the World's Top 100 Open Water Swims.



Under the management of Endurance Aventure, la Traversée Internationale du lac Memphrémagog offers the following events:


Before 1950, no one had attempted to cross lac Memphrémagog in a solo marathon swim. Lac Memphrémagog is a glacial lake located between Newport, Vermont, United States and Magog, Québec, Canada. But in the early 1950s, local Sherbrooke swimmer Lamontagne Lorenzo made the first attempts. On 9 July 1955, the 24-year-old swam for 21 hours 30 minutes before being pulled from the water 2 miles from his goal. Five weeks later on 21 August 1955, 19-year-old William Francis Billy O'Connor became the first person to complete a crossing of lac Memphrémagog in 18 hours 35 minutes, swimming from south to north despite a storm that hit near midnight.

O'Connor took a 10-minute break every hour to replenish his energy and power. After walking into lac Memphrémagog at 4:30 pm, and braving a storm late at night, he walked up on the shore of Magog at 11:05 am.

25 years after O'Connor's feat, the first crossing took place in 1979, a distance of 42 km between Prouty Beach, Newport (USA) and Pointe Merry in Magog (Quebec). The crossing was held during a summer festival with cultural programs, shows, vendors, and entertainment.


2013 Traversée Internationale du Lac Memphrémagog


3 August 2013


Lac Memphrémagog in Magog, Québec, Canada

Prize Money


Swimming/Natation Canada and organiser La Traversée Internationale du Lac Memphrémagog under the direction of Jean-Luc Boisvert. The cultural part of the Traversée and overall event coordination is done by Productions du Palais while Endurance Aventure is in charge of the organization of the sport events.


34 km




City Lac Memphrémagog

State/County/Province Quebec

Country Canada

Region Americas

Event Information

Month: July


Water Temp: under 20°C (68°F)

Class: Professional

Wetsuit: No

FINA Open Water Swimming Grand Prix Series sites

The FINA Open Water Swimming Grand Prix series consists of races in

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