How long is the coastline of New Zealand? DOC says it is about 15,000 km, Navigatus Consulting use 15,000km in the MOSRA15 model, NZ post says between 15,000 and 18,000 km, and NIWA says 18,000km  Which is it? The answer is… both? …neither? It depends on how you measure it. It turns out that its..