Waihao Box is a freedom camping area in South Canterbury, situated beside the Waihao River near Willowbridge, roughly 10 kilometres off State Highway 1 via gravel roads.

The parking area sits within a reserve where the river takes on the appearance of a small lagoon, creating a quiet and scenic setting.

The site connects to the Waihao River Walkway, which follows the south bank of the river and offers views of limestone cliffs and unique limestone outcrops. Nearby, the Black Hole is a popular swimming hole with fishing opportunities.

The surrounding area carries significant natural and human history, including the Arno basin, once a swamp from which large quantities of moa bones were recovered.