with a linear extent of 20.05 miles (32.23 km). The Kazumura Cave Atlas lists 101 entrances, all on private property. Under current Hawaiian laws, landowners must be asked before entering any lava tubes on their property. At least one landowner runs paid adventure tours through his section of the cave as of 2016. See also List of longest caves in the United States Footnotes References External links Kazumura Cave Caves of Hawaii Lava tubes Landforms of Hawaii (island)