Tongariro Northern Circuit
||This article is written like a travel guide rather than an encyclopedic description of the subject. (March 2009)|
The Tongariro Northern Circuit, one of the New Zealand Great Walks, is a three to four day tramp in Tongariro National Park, New Zealand. The hike includes the Tongariro Alpine Crossing, a day's march that incorporates the Northern Circuit's most stunning scenery. The complete trail forms a 50 kilometres long loop trail that circumnavigates Mount Ngauruhoe. Approximately 7,000 trampers complete the walk each year. This compares to the approximately 25,000 who walk only the Tongariro Crossing section. 
When to Go
The best time to go is during the summer months (from December to March). It is important to get information about the weather beforehand. Heavy rain can cause small rivers and therefore complicate the progress of the march significantly, some alpine parts are also quite exposed. Moreover the beautiful scenery will be missed. Mountaineering equipment is required during the winter.
There are four New Zealand Department of Conservation (DOC) huts around the circuit - Mangatepopo, Ketetahi, Oturere and Waihohonu. Since this is nominated a Great Walk, you must pay in advance to stay in the huts or the nearby campsites. This applies to the summer season from October 1 to April 30, during the other time these huts become backcountry huts, which can be used with a cheaper annual hut pass. It is forbidden to camp within 500 metres off the track.
The Northern Circuit is a round trip that can be walked either way. The tour below describes the clockwise route starting in Whakapapa Village. There is a car park and a DOC Visitor Center where all necessary information is available. There are other possible starting points from various road ends along the track.
Whakapapa Village to Mangatepopo Hut
Day One, 3-5 hours, 8.5 km.  Starting the track at the Whakapapa Visitor Centre, it follows mainly the Whakapapa track over eroded plains. It crosses many smaller river beds and can be fairly muddy during rain. On the right side the cone of the volcano Mount Ngauruhoe is visible. The Mangatepopo Hut is 5 minutes off the main track.
Mangatepopo Hut to Ketetahi Hut
Day Two, 5-6 hours, 9 km.  This is the actual Tongariro Alpine Crossing. Starting gently up the Mangatepopo river valley it becomes a steep climb on magmatic rock. It continues through the South Crater up and over the side of Red Crater and down to the Emerald Lakes. During the walk there are picturesque views of the active volcanic scenery, weather permitting. At the Emerald Lakes, named after their colour due to minerals from thermal area, the track joins the route to Oturere Hut (1 hours 30 minutes). After the lakes, the route passes Blue Lake before descending down to Ketetahi Hut.
Ketetahi Hut to Waihohonu Hut
Day Three, 6-7 hours, 16.5 km.  The day begins with a moderate climb back to Emerald Lakes then down a relatively steep descent to Oturere Hut. One can see many abstractly formed lava formations on the way. Passing Oturere Hut the track fades into field of gravel lacking vegetation. The day finishes with a valley crossing and ascent through forest, then a descent to Waihohonu hut.
Waihohonu Hut to Whakapapa
Day Four, 5½–6 hours, 14 km.  The track follows an old pack route beside Waihohonu Stream without much climbing. On the way there are side trips to the Lower and Upper Tama Lakes (20 minutes and 90 minutes return), formed by water filled volcanic craters. Just before Whakapapa the Taranaki Falls form a 5 minute detour from the main track.
- DuFresne, Jim (November 2002). Tramping in New Zealand (5th Edition ed.). Victoria, Australia: Lonely Planet Publications Ply Ltd. pp. 121–127. ISBN 1-74059-234-4.
- "Tongariro Northern Circuit Turangi Taupo area Great Walk". New Zealand Department of Conservation. September 14, 2006. Retrieved 2007-05-11.
- Terralink International (2002). Ruapehu & Tongariro Recreation Areas (Map). 1 : 50,000. large scale NZ topographic map series (1st ed.).