Actually it depends, Fern Cave is the largest cave in volume and Honeycreek is the longest. Hope this helps!
There are over 3,000 caves in Texas, mostly west of the town of San Antonio. Honeycreek cave is over 20 miles long thanks to hard-care cave explorers like Bill Steele, Kurt Menking, and Don Broussard.
The Mammoth Cave is the largest cave in the United States.
The largest bat cave is the Samal Bat Cave. Clarify the type of cave you want.
The largest bat colony in the entire world is located in Bracken Cave just outside of San Antonio, Texas. the largest urban bat colony in the world is located under the Congress Avenue bridge in Austin, Texas. Both are colonized by Mexican free-tailed bats.
The Son Doong cave is the largest cave in the world. This cave is located in Quang Binh province,Vietnam.
The Mammoth Cave system, located in Kentucky, is the largest cave in the world.
Mammoth Cave with over 390 miles of passageways is the largest known cave complex.
Exit Cave in Tasmania.
The world's largest cave system is located in the state of Kentucky. The name of the cave system is Mammoth's Cave. The cave system is part of the national parks.
Texas is the second largest US State by area.
The largest cave in the world is the Son Doong cave in Vietnam. It is over five and a half miles long, and has a jungle and a river.ADDED: "the largest cave" does not define the criteria and 5.5 miles is really very short as major caves go, so I looked it up. In 2009 a joint Vietnamese / British expedition found it had the world's largest passage cross-section. So not the largest cave, but a cave containing an unusually large passage.
Mammoth cave.