The Trial Mountain Circuit is a fictional circuit that has appeared in all mainline versions of Gran Turismo except Gran Turismo Sport, and has also featured in Tourist Trophy and Gran Turismo PSP. It is a almost 4 kilometres circuit run on tarmac which appears to be set in a forest clearing within a mountainous area. The circuit features several blind corners, three tunnels, a long, uphill back straight and a series of fast compound corners. It is seen by most players as one of the easiest circuits in the Gran Turismo Series. That is, one of the easiest to drive and memorize. However, it is one of the hardest circuits to drive fast due to the length of the circuit.