Use {{location|NZ}} to tag expeditions that took place in New Zealand. It will add Category:Expeditions in New Zealand to the expedition.
Using ISO 3166-2 abbreviations, you may also tag the region that the expedition took place in.
If the category link appears red, do not worry and create the category. Make sure that it is included in the appropriate parent category, for instance, Category:Expeditions in Otago is a subcategory of Category:Expeditions in New Zealand. The subcategories should be sorted in by their respective code.
Examples
{{location|NZ}}: New Zealand{{location|NZ|OTA}}: Otago
