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Son Doong is one of three Asian representatives on this list, alongside Reed Cave in China and Pak Ou Cave in Laos. The top spot goes to Mammoth Cave (USA) – the world's longest cave system with a total length of approximately 676 km. Following closely are Škocjan Cave (Slovenia) and Waitomo Caves (New Zealand).
Discovered in 1990, Son Doong Cave holds the title of the world's largest natural cave with a volume of up to 38.5 million cubic meters. Located within the Phong Nha - Ke Bang National Park complex - a UNESCO World Heritage site, Son Doong has been open to tourists since 2013.
A tour to Son Doong Cave is considered the most expensive in Vietnam, costing around 70 million VND. (Photo: Son Doong Cave)
Measuring 9km in length, reaching a height of 200m, and a width of 160m, Son Doong boasts the tallest stalactite formations in the area, up to 70m high. International media have even likened this cave to being so vast that it could accommodate a Boeing 747 flying through without collision.
Despite its challenging terrain, tours of Son Doong Cave consistently attract a large number of international tourists. Oxalis – the only company providing tours there – reports that all tours for 2024 are fully booked.
Dubbed the most expensive tour in Vietnam, Son Doong Cave attracts tourists with its unique 6-day, 5-night adventure experience at a cost of approximately 70 million VND (3,000 USD) per person.
