mammoth cave is over 350 miles long.
seirra
worlds longest toenailes
The longest cave river is in america.
The worlds longest road bridge is in China
Mammoth Cave in Kentucky is the world's longest known cave system. The Jewel Cave system near Custer, South Dakota is ranked as the second longest known cave system.
mammoth cave KY is a cave in Kentucky that is really, really, really long i mean miles long
The Worlds Longest limo is 100 feet long ( 30 meters )
Mammoth Cave
Mammoth Cave, Kentucky
mammoth cave if you researched how big mammoth cave is well i don't know how long but it is the longest in the world
Mammoth Cave in Kentucky.
The longest cave in the world is the Mammoth Cave in Kentucky, United States. The scientists believed that the estimated length of the cave is 1,000 mi or 1,600 km.