Touri Cave

To'uri Cave is a karst cave located on Mangaia, Cook Islands in the Tava'enga district. The cave contains two running subterranean streams, one freshwater and the other salt. There is a 400-metre (1, 300 ft) sump inside the cave which ends in a permanent sump.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).