A hole, or funnel shaped cavity made in the earth by the action of water on the soil, rock or underlying strata
Data Dictionary for sinkhole_pnt: https://docs.topo.linz.govt.nz/data-dictionary/tdd-class-sinkhole_pnt.html
This layer is a component of the Topo50 map series. The Topo50 map series provides topographic mapping for New Zealand and it's offshore dependancies, at 1:50,000.
For some small islands the printed map scale is 1:25,000. Although presented at 1:25,000 this layer, for all intents and purposes, forms part of the Topo50 map series.
Further information on Topo50:
http://www.linz.govt.nz/topography/topo-maps/topo50
