Mill Flat Campsite sits within Mount Richmond Forest Park in New Zealand's Marlborough region, occupying an extensive grassy clearing on the floor of a mountain valley and surrounded by beech forest.

Managed by the Department of Conservation (DOC), it offers 20 non-powered tent sites on a first-come, first-served basis with no booking required.

The setting lends itself to a range of activities including picnicking, walking, swimming, tramping, fishing, and hunting. Dogs are welcome with a valid DOC permit, obtainable from the nearest DOC office.

Note that forestry operations in the area can periodically close access roads into the park, so checking road conditions before visiting is advisable.