The short answer
Sơn Đoòng Cave: what visitors should know first
Only if you are a fit, committed adventurer with a large budget. Sơn Đoòng is a multi-day camping expedition with limited permits, and it is closed in the wet months. For most families, the easier caves in the park give a good taste of the region.
History and context
The story behind Sơn Đoòng Cave
Local man Hồ Khanh found the entrance on 10 December 1990 while looking for agarwood, and relocated it in 2008. A British Cave Research Association expedition surveyed it in April 2009. The first guided tourist group went in August 2013. Since 2017 only Oxalis Adventure Tours has permission to take visitors in.
Useful facts
Sơn Đoòng Cave facts at a glance
- Location
- Phong Nha-Kẻ Bàng National Park, Quảng Trị Province
- Experience type
- Multi-day guided expedition
- Size
- Main passage over 5 km long, 200 m high, 150 m wide
- Season
- Permits January to August; closed September to December
- Operator
- Oxalis Adventure Tours is the only authorised operator since 2017
- Cost signal
- Very high; check the operator's current price
Why it matters
Why Sơn Đoòng Cave is worth your time
Sơn Đoòng is the largest known cave passage in the world by volume, with a main passage over 5 km long, 200 m high and 150 m wide. A 2009 survey put its volume at about 38.5 million cubic metres. It has two large dolines where light enters and trees grow inside.
It matters to Phong Nha because it turned a quiet district into a global caving destination. Even if you never go, knowing it is in these hills changes how you see the karst around the township.
Highlights
What not to miss
- 01
The scale
A passage so large that it holds its own weather and a jungle under a collapsed roof.
- 02
The dolines
Collapsed sections let in light so trees and plants grow inside the cave.
- 03
Expedition style
The trip is a trek and camping adventure, not a sightseeing stop.
Plan your visit
How to experience it
Sơn Đoòng is not a cave you drop into on a day trip. Visits are guided, small-group expeditions of several days, with a trek through jungle, river crossings and camping inside the cave. The operator provides guides, porters, equipment and food, and you must meet its fitness requirements.
Book many months ahead, because permits are limited and issued January to August. After August, rain raises river levels and the cave is largely inaccessible; it is officially closed from September to December. Confirm the dates and requirements with the operator, not with a reseller.
If an expedition is not for you, you can still enjoy the region. Spend your time on the boat cave, Paradise Cave and the landscape around the township, and read about Sơn Đoòng at a local exhibit or in photographs.
Plan with confidence
Small decisions that make the visit easier.
- Book months ahead; permits are limited
- Check the fitness requirements before you pay
- Treat prices as indicative and confirm them with the operator
- Plan other caves for family members who will not join
Know before you go
Timing, access and comfort
- Area
- Phong Nha-Kẻ Bàng National Park, deep in the mountains
- Time needed
- Several days on an organised expedition
- Best time
- January to August, when permits are issued; closed from September to December
- Walking level
- Demanding
- Senior comfort
- Not suitable for casual or older visitors. The trip involves long jungle treks, river crossings, camping and steep descents. Operators set fitness requirements, and you need to meet them.
- Tickets and access
- Permits are limited and the only authorised operator is Oxalis Adventure Tours. Prices have changed over the years and are high; check the current expedition cost, dates and requirements on the operator's site.
Best for
Plan it with
Plan the practical part
Hotels near Sơn Đoòng Cave
Staying close keeps journeys short — useful for early starts and for anyone who tires quickly.
Affiliate link — we may earn a commission at no extra cost to you. Prices are live on the partner site.
Travelling with parents?
Not suitable for casual or older visitors. The trip involves long jungle treks, river crossings, camping and steep descents. Operators set fitness requirements, and you need to meet them.
Raahzo can arrange an arrival or day companion who handles tickets, queues and pacing, and keeps the family updated.
See concierge supportFAQs
Can I visit Sơn Đoòng as a day trip?
No. Visits are multi-day guided expeditions with limited permits. Day trips to other caves are available.
When is Sơn Đoòng open?
Permits are issued January to August. The cave is officially closed September to December.
Who runs tours to Sơn Đoòng?
Since 2017 only Oxalis Adventure Tours has permission to take visitors in.
Sources and further reading
Timings, fees and access rules change. Recheck with the official source before you travel.
