Mangatangi Trig Campsite sits within the Hunua Ranges Regional Park, southeast of Auckland, and is accessible by foot only.

The facility is very basic, centered on a dirt-floor shelter whose roof doubles as a rainwater collection surface feeding an on-site tank — water must be boiled for at least five minutes before drinking. A toilet is also available on site.

The campsite accommodates up to 20 people with a maximum stay of seven nights, and advance booking is required.

The surrounding Hunua Ranges are home to the Mangatangi Reservoir, New Zealand's largest water-supply dam, which draws fly fishers seeking rainbow trout.