The Tongariro Crossing has been described as "the greatest one-day walk in New Zealand". On the North Island, near to Lake Taupo, it's a demanding 17km hike across volcanic terrain. Although it can be done as part of the Tongariro Northern Circuit, a 4 day walk, it's usually done in isolation as a one-day hike, which was energetic enough for me! It's supposed to take 6-8 hours, but will obviously vary according to fitness levels and how often you want to stop. There are a couple of bus companies that do shuttle runs to the start and end of the track - the area's not well-served by public ...
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