The Tongariro Crossing is a full-day walk in a Unesco World Heritage Site. The crossing takes place amongst the three volcanoes of the central North Island of New Zealand: Ruapehu, Ngauruhoe, and Tongariro. (Often known as the mountains and foothills of Mt Doom in SIr Peter Jackson's film realisation of 'The Lord of the Rings'. A key part of the walk is the climb up the saddle between the two non-dormant volcanoes Ngauruhoe and Tongariro. The weather s extremely variable, suffering distinct microclimates. The weather can turn from clear sky to blizzard within two hours in a worst case scenario. Consquently, the walker is well-advised to BE PREPARED.