What is the name of the fictional forest circuit with a tunnel in Gran Turismo?

The fictional forest circuit with a tunnel in Gran Turismo is Deep Forest Raceway.

Deep Forest Raceway is an original Gran Turismo circuit rather than a real-world venue. It debuted in the first game and was designed as a fast, wooded course with elevation changes, sweeping bends, tighter corners, and tunnel sections. Its forest setting gives it a distinctive atmosphere among the series’ fictional tracks.

The course rewards momentum and smooth driving. Long, flowing sections favor powerful sports cars, while the tighter turns punish late braking and poor positioning. The tunnel also creates a memorable visual transition between the shaded forest and more open sections of the lap.

Players sometimes confuse Deep Forest Raceway with Trial Mountain Circuit, another fictional Gran Turismo track that also uses a mountainous forest setting and tunnels. The names are different, however: Trial Mountain emphasizes a mountainous route, while Deep Forest is the forest-themed circuit asked about here. Deep Forest Raceway has returned in multiple mainline entries, though it was absent from Gran Turismo Sport.