Circuit of the Americas (COTA) is a 3.427-mile (5.515 km) motor racing circuit in an unincorprated area of Travis County, Texas, just outside of Austin city limits. It is the host of the Formula One United States Grand Prix. The circuit also hosts the Motorcycle Grand Prix of The Americas, a round of the Road Racing World Championship, commonly known as MotoGP, the FIA World Endurance Championship, as well as the Tudor United SportsCar Championship.