Which country is the endurance race which is part of the most prestigious unofficial motorsport achievement held in?
24 Hours of Le Mans The 24 Hours of Le Mans (French: 24 Heures du Mans ) is the world's oldest active sports car race in endurance racing, held annually since 1923 near the town of Le Mans, France. It is one of the most prestigious automobile races in the world and is often called the "Grand Prix of Endurance and Efficiency". The event represents one leg of the Triple Crown of Motorsport; other events being the Indianapolis 500 and the Monaco Grand Prix.
6 Hours of Watkins Glen The Six Hours of Watkins Glen (currently sponsored as the Sahlen's Six Hours of The Glen) is a sports car endurance race held annually at Watkins Glen International in Watkins Glen, New York. The race dates from 1948, and has been a part of the SCCA National Sports Car Championship, United States Road Racing Championship, World Sportscar Championship, IMSA GT Championship, Rolex Sports Car Series and currently the United SportsCar Championship.