New Zealand sits in the southwestern Pacific Ocean approximately 2,000 kilometers east of Australia. The country comprises two main landmasses—North Island and South Island—separated by Cook Strait, which measures 22 kilometers at its narrowest point. Stewart Island/Rakiura lies 30 kilometers south of South Island across Foveaux Strait. The Chatham Islands, located 800 kilometers east of the main islands, form New Zealand's easternmost territory. The total land area spans 268,021 square kilometers, making New Zealand slightly smaller than Japan and slightly larger than the United Kingdom. The country's exclusive economic zone covers 4.2 million square kilometers of ocean, extending over fifteen times its land area. No point in New Zealand lies more than 128 kilometers from the sea.
South Island contains the Southern Alps/Kā Tiritiri o te Moana, a mountain chain running 500 kilometers along the island's western spine. This range formed through the collision of the Pacific and Australian tectonic plates, which meet directly beneath New Zealand. The Southern Alps contain 3,155 named mountains exceeding 2,000 meters. Mount Cook/Aoraki reaches 3,724 meters, making it New Zealand's highest peak. The mountain lost approximately 30 meters of height in December 1991 when a rock and ice avalanche removed its summit. Seventeen named peaks in the Southern Alps exceed 3,000 meters. The Tasman Glacier flows 23 kilometers down Mount Cook's eastern face, making it New Zealand's longest glacier at present, though it has retreated approximately 180 meters per year since 2000. Franz Josef Glacier and Fox Glacier descend the western slopes of the Southern Alps to within 300 meters of sea level, creating one of the few locations worldwide where glaciers reach temperate rainforest.
The Canterbury Plains extend 180 kilometers along South Island's east coast between the Southern Alps and the Pacific Ocean. These plains average 40 kilometers in width and represent New Zealand's largest area of flat land. Braided rivers including the Rakaia, Rangitātā, and Waimakariri carry glacial sediment from the mountains, depositing material that built the plains over millions of years. The plains contain New Zealand's most productive agricultural land. Banks Peninsula projects 50 kilometers into the Pacific Ocean south of Christchurch, formed by two overlapping shield volcanoes that erupted between 11 and 5.8 million years ago.
Fiordland occupies the southwestern corner of South Island, covering 12,500 square kilometers. Glaciers carved fourteen major fiords into this coastline during ice ages ending 10,000 years ago. Milford Sound/Piopiotahi penetrates 15 kilometers inland from the Tasman Sea, with rock walls rising 1,200 meters directly from the water. Mitre Peak reaches 1,692 meters elevation at the sound's entrance. Doubtful Sound extends 40 kilometers inland and reaches depths of 421 meters, making it three times longer and ten times larger by area than Milford Sound. Dusky Sound, discovered by James Cook in 1770, cuts 40 kilometers into Fiordland and contains several large islands. Annual rainfall in Fiordland exceeds 9,000 millimeters in some valleys, making it one of Earth's wettest regions.
North Island displays more recent volcanic activity than South Island. Mount Taranaki/Mount Egmont rises 2,518 meters on the western coast, forming a symmetrical cone visible from 100 kilometers distance. The mountain last erupted in 1755 and volcanologists classify it as dormant rather than extinct. Egmont National Park surrounds the mountain within a circular boundary radius of 9.6 kilometers, creating the only circular national park boundary worldwide. The Tongariro volcanic complex in central North Island contains three active volcanoes. Mount Tongariro last erupted in November 2012. Mount Ngāuruhoe, standing 2,287 meters, erupted most recently in 1975 and serves as the most active cone in the complex. Mount Ruapehu reaches 2,797 meters, making it North Island's highest peak and New Zealand's largest active volcano. Ruapehu erupted most recently in September 2007. The mountain contains an acidic crater lake at its summit, with water temperatures fluctuating between 10 and 50 degrees Celsius depending on volcanic heat flux.
Lake Taupo fills a caldera created by the Oruanui eruption 26,500 years ago, the most recent supervolcanic eruption in New Zealand. The lake covers 616 square kilometers, making it New Zealand's largest lake by surface area. The lake reaches 186 meters maximum depth. Lake Taupo sits 357 meters above sea level in the center of North Island. The Waikato River, New Zealand's longest at 425 kilometers, begins at Lake Taupo and flows north to the Tasman Sea. The Taupo Volcanic Zone extends 350 kilometers from White Island offshore in the Bay of Plenty southwest to Mount Ruapehu. This zone produces the highest concentration of geothermal activity in the Australasian region. Rotorua lies within this zone and contains numerous geysers, hot springs, and mud pools. The Pohutu Geyser at Te Whakarewarewa erupts up to 20 times daily, reaching heights of 30 meters. Frying Pan Lake near Rotorua maintains water temperatures between 50 and 60 degrees Celsius and covers 38,000 square meters, making it the world's largest hot spring.
The Hauraki Gulf lies between Auckland and the Coromandel Peninsula on North Island's eastern coast. The gulf covers 4,000 square kilometers and contains more than 50 islands. Waiheke Island, 17.7 kilometers from Auckland, covers 92 square kilometers and supports a permanent population of 9,140 people as of 2018. Great Barrier Island covers 285 square kilometers at the gulf's outer edge, making it New Zealand's sixth-largest island. The Bay of Islands contains 144 islands within its boundaries on the northeastern coast of North Island. The bay extends 16 kilometers inland and covers 800 square kilometers. Russell, New Zealand's first European settlement, sits on the bay's southern shore.
Wellington occupies the southwestern tip of North Island at the entrance to Cook Strait. The city sits on the Wellington Fault, capable of producing magnitude 7.5 earthquakes. The fault last ruptured in 1855, lifting land by 6.4 meters in some locations and creating 6,400 hectares of new land through coastal uplift. Wellington experiences strong northwesterly winds that regularly exceed 60 kilometers per hour. The city records more than 22 days annually with wind gusts exceeding 60 kilometers per hour, giving it the nickname "Windy Wellington." Auckland sits on North Island's narrowest point between the Pacific Ocean and Tasman Sea, separated by only 5 kilometers. The city covers 5,600 square kilometers, including 53 dormant volcanic cones. Rangitoto Island in Hauraki Gulf emerged as the most recent volcano approximately 600 years ago. The eruption expelled 2.3 cubic kilometers of material over several decades.
Christchurch sits on the eastern edge of the Canterbury Plains at the base of Banks Peninsula. The city experiences greater temperature variation than other New Zealand cities due to its distance from moderating ocean influence. The Avon River flows 30 kilometers through Christchurch before reaching the coast. Dunedin occupies the head of Otago Harbour on South Island's southeastern coast. The city sits at 45.87 degrees south latitude, making it one of the world's southernmost cities. The Otago Peninsula extends 20 kilometers from Dunedin into the Pacific Ocean, reaching a maximum width of 9 kilometers. Baldwin Street in Dunedin holds the Guinness World Record for the world's steepest street with a gradient of 34.8 percent over 350 meters.