<Tr> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Alleged </Td> <Td> Trillion </Td> <Td> Dancing Maid </Td> </Tr> <P> The Prix de l'Arc de Triomphe is a Group 1 flat horse race in France open to thoroughbreds aged three years or older . It is run at Longchamp over a distance of 2,400 metres (about 11⁄2 miles), and it is scheduled to take place each year, usually on the first Sunday in October . </P> <P> Popularly referred to as the "Arc", it is Europe's most prestigious horse race . Its roll of honour features many highly acclaimed horses, and its winners are often subsequently regarded as champions . It is currently the world's richest turf race and third - richest horse race (behind the Pegasus World Cup and Dubai World Cup). </P>

Where is the prix de l'arc de triomphe run