Okayama International Circuit, formerly known as TI Circuit Aida, is a motorsport venue nestled in the Mimasaka region of Okayama Prefecture, Japan. Its history began in 1990, originally built by businessman Hajime Tanaka as a private racing facility meant to attract Formula One. While the circuit hosted two Pacific Grand Prix races in 1994 and 1995, it failed to secure a permanent spot on the F1 calendar. After Tanaka's bankruptcy, the circuit was purchased by Unimat Corporation and renamed Okayama International Circuit in 2005.

The circuit features a challenging 3.703 km (2.301 mi) layout with 13 turns, characterized by a blend of high-speed straights and technical corners. The first sector includes a long straight leading into a tight hairpin, demanding aggressive braking and precise car placement. The middle sector is more flowing, emphasizing aerodynamic efficiency and driver rhythm. The final sector presents a series of complex corners that reward a well-balanced chassis and confident driver inputs. The track's relatively narrow width adds to the challenge, making overtaking maneuvers difficult.

Okayama International Circuit has hosted a diverse range of racing events, including Super GT, Super Formula, Formula 3, and various national and international touring car championships. It is a popular testing ground for Japanese motorsport teams.

One of the unique aspects of Okayama is its location amidst the rolling hills of the Japanese countryside, providing a picturesque backdrop for racing. The circuit's relatively short length and varied corner types create close racing and exciting battles. While it may not be as widely recognized as Suzuka or Fuji, Okayama International Circuit holds a special place in Japanese motorsport history, offering a challenging and rewarding experience for drivers and fans alike.