The Okayama International Circuit (formerly known as TI Circuit Aida) is a 2.301-mile (3.7 km) private motorsport race track in Mimasaka, Okayama Prefecture, Japan. TI is abbreviation of "Tanaka International" after the name of the holding company, though the name of the circuit was officially "TI Circuit Aida".
The course was built in 1992 as a private race track for the wealthy. Soon, it hosted its first race, staged by veteran British drivers (which explains the circuit's corner names, such as Hobbs and Attwood).