Question: Which country is the endurance race which is part of the most prestigious unofficial motorsport achievement held in?

Context articles: 2002 VIP Petfoods Queensland 500
Triple Crown of Motorsport
Sepang 12 Hours
1986 Castrol 500
24 Hours of Le Mans
12 Hours at the Point
Sepang 1000 km
Japan Le Mans Challenge
Brno 2 Hours 30 Minutes
Dale Wood (racing driver)

The 2002 VIP Petfoods Queensland 500 was an endurance race for V8 Supercars staged at Queensland Raceway, Ipswich, Queensland, Australia on 15 September 2002.
 Race distance was 161 laps of the 3.121 km circuit, totalling 502 km.
 The event was round nine of the 2002 V8 Supercar Championship Series.
 It was the fourth and last Queensland 500 to be held for V8 Supercars, although the race name was revived in 2006 for a club level endurance race for Sports and Touring Cars.
The Triple Crown of Motorsport is an unofficial motorsport achievement, often regarded as winning three of the most prestigious motor races in the world in one's career:
The Sepang 12 Hours (formerly known as the Malaysia Merdeka Endurance Race and Merdeka Millennium Endurance Race), is a 12 Hours endurance racing event held annually since 2000 at the Sepang International Circuit on December in Malaysia.
The 1986 Castrol 500 was an endurance race for cars complying with CAMS Touring Car regulations, which were based on FIA Group A rules.
 The event was staged on 14 September 1986 over 129 laps of the 3.9 km Sandown International Motor Racing Circuit in Victoria, Australia, a total distance of 503 km.
 The race, which was Round 3 of both the 1986 Australian Endurance Championship and the 1986 Australian Manufacturers' Championship, was the 21st "Sandown 500" endurance race.
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.
The 12 Hours at the Point was an endurance race for sports cars and sedans hosted by the Washington, D.C. Region of the Sports Car Club of America (SCCA).
 The initial event was staged in June 1999 at Summit Point Motorsports Park in Summit Point, West Virginia.
 With the exception of 2006, the race has been held on the weekend closest to June 1.
 It is the oldest perennial SCCA-sanctioned endurance race.
The Sepang 1000 km Endurance Race is a 1000 km endurance racing event held annually since 2009 at the Sepang International Circuit in December.
 The race was created out of the success of the 12-hour Malaysia Merdeka Endurance Race, but unlike the MMER is a touring car race and is limited to cars with an engine capacity of under 1800 cc .
 Originally 1900 cc was the upper limit but this was reduced in 2011.
 Despite the engine power advantage of the larger-engined cars, Class 2 1600 cc cars have won two of three races held thus far.
The Japan Le Mans Challenge (abbreviated JLMC) was an endurance sportscar series based in Japan built around the 24 Hours of Le Mans that began in 2006.
 It was run by the Sports Car Endurance Race Operation (SERO) sanctioning body and ran under the rules laid out by the Automobile Club de l'Ouest (ACO).
 It is the first endurance sportscar series in Japan since the demise of the All Japan Sports Prototype Championship in 1992, although the ACO had run a single endurance race since then, the 1999 Le Mans Fuji 1000 km.
 The series was cancelled in 2007 following two poor seasons.
The Brno 2 Hours 30 Minutes was a sports car endurance race held at the Automotodrom Brno in Brno, Czech Republic.
 The race was first held in 1988 as a round of the World Sportscar Championship.
 It was revived in 1997 for the International Sports Racing Series, and continued until 2002 under the FIA Sportscar Championship.
 It has since been absorbed into the 24H Series, which in 2015 organised the Hankook 12 Hours Epilog of Brno, and in 2016 the Hankook 24 Hours Epilog of Brno.
 This was the first ever 24 hours endurance race in the Czech Republic.
Dale Wood (born 9 June, 1983) is an Australian racing driver who drives for Erebus Motorsport in the Virgin Australia Supercars Championship.
 He currently resides in Melbourne, Victoria.
 He commenced his full-time V8 Supercar career in 2009 with the newly formed team Kelly Racing team, having raced previously for the Tasman Motorsport aligned Greg Murphy Racing Fujitsu series squad.
 Wood was replaced after the Hidden Valley round although he returned to the team for the endurance race season, pairing up with Jack Perkins.
 He returned to the team a year later, again in an endurance race role.