Where does this come from, and can I check it?

Son Doong Cave in Vietnam features a cavern passage so massive that it could fit an entire city block. The figure is taken from National Geographic, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a world geography fact?

Yes. It sits on the World Geography shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Son Doong Cave contains the largest known cavern passage on Earth

Son Doong Cave in Vietnam features a cavern passage so massive that it could fit an entire city block.

Located in Phong Nha-Ke Bang National Park, Son Doong was carved by a subterranean river beneath limestone mountains millions of years ago. The main cavern passage stretches over five kilometres in length and reaches heights of 200 metres. Collapse of the cave ceiling has allowed sunlight to penetrate, creating internal rainforest ecosystems complete with unique clouds.

Son Doong Cave 5 photograph — Doug Knuth from Woodstock, IL · CC BY-SA 2.0 · licence · source

Where this comes from

National Geographic

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

Go further

World Geography trivia Volume Calculator

More facts like this

Mammoth Cave is the world longest recorded cave systemLocated in Kentucky, Mammoth Cave contains over 680 kilometres of surveyed subterranean passages.Hang Son Doong is the largest cave passage by volumeIts biggest cavern is large enough to house a 40-story skyscraper Dripping mineral water builds stalactites and stalagmites in cavesPrecipitated calcium carbonate forms hanging icicle structures and floor mounds Mammoth Cave is the longest known cave systemMore than 680 kilometres of passages have been surveyed beneath Kentucky Table Mountain is one of the oldest mountains in the worldOverlooking Cape Town in South Africa, Table Mountain summit plateau is estimated to be 300 million years old.Salar de Uyuni is the world largest mirror during the rainy seasonSpanning over 10,000 square kilometres in Bolivia, Salar de Uyuni is the largest salt flat on Earth.

Tags: son doong, vietnam, caves, geology

Son Doong Cave contains the largest known cavern passage on Earth: the short answers

Where does this come from, and can I check it?: Son Doong Cave in Vietnam features a cavern passage so massive that it could fit an entire city block. The figure is taken from National Geographic, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a world geography fact?: Yes. It sits on the World Geography shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.