The Tongariro Alpine crossing is a one-way trek across the active volcano, Mount Tongariro. The crossing takes around 6-8 hours to complete and can only be done when the weather conditions are clear. The trek starts at the southern end of the mountain and crosses three volcanic cones, Mt Ngauruhoe, Mt Tongariro and Red Crater. There are a number of huts along the way that can be used for rest stops, but it is advised to bring a full set of camping gear if intending to stay overnight. Due to its location and challenging terrain, the Tongariro Alpine crossing is considered to be one of New Zealand’s top treks.