Harwood's Hole
Abel Tasman National Park
![View original image Harwood's Hole](http://tramper.nz/imgcache/11/11692-feature.jpg)
176m vertical shaft, the deepest natural shaft in New Zealand, and the Southern Hemisphere's deepest sinkhole.
176m vertical shaft, the deepest natural shaft in New Zealand, and the Southern Hemisphere's deepest sinkhole.