Broken River Cave is a 362-meter-long cave in New Zealand, located on Arthur's Pass Road from Christchurch on the west coast. It is 40 km from Arthur's Pass and from Christchurch.
The river takes a shortcut under a hill. A sign outside the cave reads "Cave Stream Reserve".
In summer when the water is warmer and lower it is a rather interesting and popular spot to spelunker, however in spring and during heavy rains, it can be rather dangerous.
External Links
Cave Stream Scenic Reserve
Showcaves.com