Legend has it that the world's number one one-day hiking route - the Tongariro Mountain Trail, 19km, 8 hours 29 minutes. The highest point of the Tongariro Mountain Trail - the Red Crater. 1900. The steep ridge is full of gravel and can only allow two or three people to pass carefully. On a clear day, you can easily see the Taranaki Mountain in the west, and eastwards the magnificent Emerald Lake and the sacred Blue Lake.