Onamalutu Campsite sits within the Onamalutu Scenic Reserve in the Onamalutu Valley, about 30 minutes' drive from Blenheim in Marlborough's Richmond Range foothills.

The campsite occupies spacious grassy flats beside a remnant stand of ancient podocarp forest dominated by kahikatea and matai — a rare survival in a valley largely cleared for farming since the 1800s.

The reserve was established in 1901 when a local sawmiller donated the surviving forest and surrounding land for public recreation.

The DOC-managed campsite offers 50 non-powered tent sites and a small number of powered sites, with flush toilets, a sink, stainless-steel benchtop, and picnic tables.

The Ōhinemahuta River — whose name was corrupted over time into "Onamalutu" — flows through the reserve and is accessible via a short walk through the forest. Sandflies can be prevalent near the river. Several short tracks wind through the podocarp forest.

No fires are permitted on site.