Short walk to Harwood's Hole, a deep vertical shaft.
Harwood's Hole is a dry sinkhole, and at 176m New Zealand's deepest natural vertical shaft. The hole was only entered as recently as 1958, and remains accessible only to experienced cavers, although a walk to the mouth is worthwhile.
Warning: the shaft is unfenced. Take extreme care with children. Do not throw rocks into the shaft as cavers may be below.
The walk sets off from the car park and camping area through dry beech forest. After 30 minutes, a side trail leads up to an outcrop of delicately fluted marble with limited views of the hole but good views of the Takaka Valley to the west. The main trail continues along a rocky gully to the hole itself. The walls of the hole extend high above, and also far below, with the bottom of the shaft well and truly hidden from sight.