This article is from the New Zealand FAQ, by Phil Stuart-Jones and Lin Nah with numerous contributions by others.
Mt Cook: highest point in NZ. A landslide in December 1991 lowered the
3764m summit by about 10 metres. NZ has 28 peaks over 3000 metres. The
lowest (Mount Aspiring) is the only one outside Mount Cook National Park.
Also within the park is the Tasman Glacier, which is about 20 kms long.
The North Island's main mountains are all volcanoes: Ruapehu (2797m/9175'),
Ngauruhoe (2291m), and Tongariro (1968m) in the centre, and Taranaki
(2518m) to the west.
Lake Taupo; 40.2 km long, 27.4 km wide, 606 sq km, depth 159m
Lake Waikaremoana; 19.3 long, 9.7 km wide, 54 sq km, depth 256m
The artificial lakes in the North Island deeper than both are Lake Ohakuri
(287m) and Lake Whakamarino (274m).
Lake Wakitipu 77.2 by 4.8 km, 293 sq km is 310m deep. It's noo but a puddle
compared to Lake Hauroko (443m deep). Both are glacial in origin.
 
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