Majlis al Jinn is the second largest cave chamber in the world by surface area. The base of the cave is 624,000 square feet, the size of nearly 11 football fields.
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The valley of the caverns. Camuy is a town on the northwestern Atlantic coast, which with one big claim to fame: the Río Camuy Cave Park. It is the third-largest cavern system in the world, with a flowing underground river.
The Geological History of the Jenolan CavesScientists have determined, through the examination of the clay found in the caves, that the Jenolan subterranean system is around 340 million years old. This makes it the oldest known and dated open cave system in the world, and it is still being heavily researched today.
#1: United States Caves (45,000)Stretching from sea to shining sea, the United States harbors an estimated 45,000+ caves, the product of millions of years of geology at work. The country's varying terrains — limestone-rich regions, rugged mountains, and desert areas — offer a diverse array of caves.
The Son Doong Cave in Vietnam is the largest cave passage in the world. This huge and intricate cave system was created by water that percolated down from a rainforest above, ultimately carving into the rock.