This article is from the New Zealand FAQ, by Phil Stuart-Jones and Lin Nah with numerous contributions by others.
There is extensive mountaineering and rock climbing available. The highest
mountains are in the South Island, but the volcanoes of the north possess
their own challenge. Snow and ice climbing is available on faces up to
2300 metres high. Multi-pitch rock routes are also available, sometimes on
excellent rock, but almost exclusively in an alpine setting. Developed
crags abound on both islands, but are currently more extensive in the
south. There is a wide variety of rock types available.
The New Zealand Alpine Club now has a web site at:
http://www.wcc.govt.nz/~nzac/default.htm
with information about the club, about climbing and outdoor activities in
NZ, and links to related sites.
There is a web site at:
http://john.chem.canterbury.ac.nz/climb/
but access is restricted to within NZ only (traffic costs and all that).
 
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