Press & media
Writing about Phong Nha or Son Doong? Here are verified facts and figures you can cite, kept current. For quotes, data or imagery, get in touch and we'll help fast.
Verified facts you can cite
- Son Doong volume
- About 38.5 million cubic metres, the largest cave passage on earth.
- Son Doong capacity
- Capped at 1,000 visitors per year for conservation.
- Availability
- Sold out through 2027; 2028 spots open and filling fast (June 2026).
- The park
- Phong Nha-Ke Bang, a UNESCO World Heritage Site, with 400+ caves.
- The karst
- Around 400 to 450 million years old, the oldest major karst in Asia.
- Transboundary status
- Extended in July 2025 to include Hin Nam No in Laos, Vietnam's first transboundary natural World Heritage site.
Figures checked June 2026. Please link to phongnha.tours when citing.
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