The Big Room in Carlsbad Caverns is the largest cave chamber in North America, with 8.2 acres of floor area. Additionally, Lechuguilla Cave is the deepest and third-longest cave in the United States. The caves in Carlsbad Caverns are unusual, as they formed from sulfuric acid instead of carbonic acid.
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The Mulu Caves, located in Gunung Mulu National Park on the island of Borneo, are home to the world's largest cave chamber by surface area, as well as one of the largest cave passages on Earth.
Sarawak Chamber is the largest known cave chamber in the world by area and the second largest by volume after the Miao Room in China. It is in Gua Nasib Bagus (Good Luck Cave), which is located in Gunung Mulu National Park, in the Malaysian Territory of Sarawak on the island of Borneo.
Postojna Cave (Slovene: Postojnska jama; German: Adelsberger Grotte; Italian: Grotte di Postumia) is a 24,340 m (79,860 ft) long karst cave system near Postojna, southwestern Slovenia.
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.
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 entrance to Cathedral Caverns in Grant, Alabama, USA, is the largest cave opening in the world. Measuring 38.4 m (126 ft) wide and 7.6 m (25 ft) high, Cathedral Caverns, which is approximately 1,220 m (4,000 ft) long, was originally known as the Bat Cave until it was developed into a tourist attraction after 1955.
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.
Hranice Abyss (Czech: Hranická propast) is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice, Czech Republic. The greatest confirmed depth is 519.5 m (1,704 ft), of which 450 m (1,476 ft) is underwater.