Grand Valley East is a fictional course that appears in all Gran Turismo games to date excluding Gran Turismo 3 A-spec. And just like the version of the track, it is full of fast, technical turns. Since it is shorter, it is more suitable to lighter and older vehicles. To complete the course without any problems, you need a nimble car. And don't forget to drive the car controllably, since the crests may spin your car if you're not careful.
Grand Valley East (in purple) superimposed onto the whole circuit.