Ruakuri Cave is the largest cave in the Waitomo area of New Zealand. It was first discovered by local Māori between 400 and 500 years ago. The name Ruakuri, or "two dogs" was created when wild dogs were discovered making their home in the cave entrance some 300 years later. 
Major features of the Ruakuri Cave include Holdens Cavern (named after James Holden who first opened the cave to the public), The Drum Passage, The Pretties and The Ghost Passage.
The cave was open to the public from 1904 until 1988, when it was closed due to a legal and financial dispute. It was reopened in 2005.
Inside there is a dynamic natural environment, with glowworms, limestone formations, underground rivers, and hidden waterfalls.
The guided tour through the Ruakuri Cave starts down a long spiral ramp to the bottom of the cave. This leads to a room full of stalactites, and rare limestone formations that have been created over millions of years. Some of which are covered with a kind of coral (known locally as "popcorn"). There are also underground rivers and waterfalls. The waterfall is only around one and a half metres deep, but it sounds much louder underground.
Also in the cave are fossils, a remnant from the time when the area was beneath the sea. There are still living creatures in the cave such as: the glowworms for which the Waitomo Caves are famous. The walls of the glowworm caves were covered with pinpricks of light, giving the effect of a starry night.
The glowworms are the larvae of fungus gnats, but they spend most of their lives in the larval state. Amazingly they manage to find food – insects that fly into the cave, or occasionally they just eat one another! Surrounded by life and light, in a place that should be dark and dead, is the reason the Maori thought that there was something special about this place.
- "Ruakuri Cave Tours". New Zealand Tourism Guide.
- "Waitomo Caves History". ICG (NZ) Ltd.
- "Prime Minister to re-open spectacular Ruakuri Cave" (Press release). 26 July 2005.
|Wikivoyage has a travel guide for Waitomo.|