How long is the coastline of New Zealand? DOC says it is about 15,000 km https://www.doc.govt.nz/globalassets/documents/science-and-technical/docts10.pdf, Navigatus Consulting use 15,000km in the MOSRA15 model http://mosra15.navigatusconsulting.com/login, NZ post says between 15,000 and 18,000 km https://collectables.nzpost.co.nz/new-zealand-coastlines/, and NIWA says 18,000km https://environment.govt.nz/publications/a-classification-of-new-zealands-coastal-hydrosystems/. Which is it? The answer is… both? …neither? It depends on how you measure it. It turns out that its..