Blowhole

A blowhole is a sea cave the gets exposed inland.  This happens when the roof of the cave collapses.  When the mouth of the cave is submerged, the incoming water and air is pushed through the cave and "blows" out the other end, up though the collapsed roof, much like a geyser.

There is a fabulous trail in the northern part of the Catlins called "Jack's Blowhole Track."

Despite the unfortunate name, it is a place of raw natural beauty and has nothing to do with the lower intestines.

The Blowhole

The blowhole is located 200 meters inland and is about 55 metres deep (spelling on purpose because I am bilingual).  55 metres is about 180 feet.  The blowhole does not have a lot of fencing around it so you have to be cautious as its a big drop with no way out, assuming you survive the fall.

Another great feature of this walk is the beach that is not reachable, at least easily.  This is a haven for rare yellow-eyed penguins (Megadyptes antipodes).  These penguins are native to New Zealand but do not venture close to humans. They come ashore in the early evening and make their way up the steep hillsides to nest.  Think about that: penguins walking up steep hills.  This takes patience to observe.  I did not have a zoom lens, but here are the photos I took (penguins indicated):

Below is a nice shot of the beach.  Really spectacular.

If the opportunity presents, go for the blowhole.