The South Island is the larger of the two main islands of New Zealand by surface area, the other being the smaller but more populous North Island. With a population of 1,256,700 as of June 2025, the South Island is home to 24% of New Zealand's 5.3 million inhabitants. The most populous cities are Christchurch, Dunedin, Nelson and Invercargill.Wikipedia
New Zealand is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island and the South Island —and over 600 smaller islands. It is the sixth-largest island country by area and lies east of Australia across the Tasman Sea and south of the islands of New Caledonia, Fiji, and Tonga. The country's varied topography and sharp mountain peaks, including the Southern Alps, owe much to tectonic uplift and volcanic eruptions.Wikipedia
Compare South Island with other cities
Stack it side-by-side against cities you're considering.