What is the largest room in Mammoth Cave?

The Rotunda is one of the largest rooms in Mammoth Cave.



The largest room in Mammoth Cave National Park is commonly cited as the Rotunda, which is a massive, circular chamber located relatively close to the Historic Entrance. It covers roughly a quarter of an acre, which is an astounding amount of open space for being deep underground. The ceiling is a natural "breakout dome," created over millennia as layers of limestone collapsed and were washed away by ancient river systems. In the early 1800s, the Rotunda was the site of a significant saltpeter mining operation used for making gunpowder during the War of 1812; you can still see the remains of the wooden leaching vats today. While some specialized, remote passages in the 400+ mile cave system might have high ceilings or long corridors, the Rotunda remains the most voluminous and historically significant "room" accessible to the general public on standard tours.

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The newly discovered cave room is estimated to have a 90-foot ceiling and a floor space of 2.5 acres. By comparison, the largest room in Mammoth Cave is about 2 acres.

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The deepest point in Kentucky's Mammoth Cave is called the “Bottomless Pit.” Despite its name, this pit is not actually bottomless. It is estimated to be around 140 feet (42.7 meters) deep.

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In addition to this rich diversity of primitive sharks at Mammoth Cave, two partial cartilaginous skeletons of different species of sharks occur within Mammoth Cave. One specimen was discovered by a caver with the Cave Research Foundation and the other has been known by the park guides for years.

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There is no designated swimming area in the park and no lifeguards on duty.

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What is the temperature inside the cave? Temperatures inside the cave vary somewhat, but usually hover around 54°F (12.2°C), year-round.

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Mammoth Cave is currently mapped and explored at 426 miles (686 km), but that is just what has been discovered to date. The Cave Research Foundation (CRF), an official park partner, has mapped and explored Mammoth Cave since the late 1950s.

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In doing so, Houchin has been credited with the discovery on Mammoth Cave. While this legend has been shared and reshared for decades, the first written account of the story happened nearly 20 years after the fact. American black bears, which were once commonly seen in the area, are now rarely found in the park.

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Native people visited these caves year-round. They carried out a wide range of activities within the caves: habitation, exploration, mineral mining, ceremonies/rituals, and burial.

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Younger fossils (hundreds to thousands of years old) represent bears, raccoons, woodrats, and many bats that utilized the cave before humans started to visit it. Ongoing research will undoubtably uncover more fossil remains, but so far, no mammoths have been found in Mammoth Cave!

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