The South Island is the largest land mass, and is divided along its length by the Southern Alps, the highest peak of which is Aoraki/Mount Cook, at 3,754 metres (12,316 feet). There are 18 peaks of more than 3,000 metres in the South Island. The North Island is less mountainous than the South, but is marked by volcanism. The tallest North Island mountain, Mount Ruapehu (2,797 metres), is an active cone volcano. The dramatic and varied landscape of New Zealand has made it a popular location for the production of television programmes and films, including the Lord of the Rings trilogy.

The usual climate throughout the country is mild, mostly cool temperate to warm temperate, with temperatures rarely falling below 0°C or rising above 30°C. Conditions vary from wet and cold on the West Coast of the South Island to dry and continental in the Mackenzie Basin of inland Canterbury and subtropical in Northland. Of the main cities, Christchurch is the driest, receiving only some 640 millimetres of rain per year. Auckland, the wettest, receives a little less than three times that amount.