Hang Sơn Đoòng, VietnamCave The largest cave passage on Earth, and it is not close. Over 9 km long, around 200 metres high and 150 metres wide, roughly 38.5 million cubic metres of space, with a river running through the bottom of it, stalagmites up to 80... Open it on the map
Son Doong and the Vietnamese giantsCave The largest cave passage on Earth. Son Doong in Phong Nha-Ke Bang, Vietnam, is big enough to hold a city block, with its own jungle growing under collapsed skylights, its own weather and clouds, and a river running through it; it... Open it on the map
Every one of these is sourced
Each entry links to the record it came from. Access rules, permits and land status vary by country and are noted where the source states them, check locally before you go.
