Son Doong is the world's largest known cave passage by volume. Toggle the two doline skylights that let jungle and sunlight pour into the passage, and the river highlight that marks the Rao Thuong river channel on the cave floor.
Published figures: main passage about 5 km long (about 9 km of connected system); chamber up to about 200 m high and about 150 m wide; two large dolines let sunlight and jungle into the passage; discovered locally in 1990, surveyed in 2009.
Drag to orbit and scroll or pinch to zoom. Everything renders on your device with WebGL.
Son Doong Cave 3D Explorer
This browser explorer shows Son Doong Cave in cross-section: a giant winding passage that widens into a vaulted chamber, with two doline openings where the ceiling has collapsed and let sunlight and jungle pour in, plus the river channel that cuts across the cave floor.
Son Doong sits in Phong Nha-Ke Bang National Park, Quang Binh Province, Vietnam. A local farmer found the entrance in 1990, but the passage was not surveyed until the British Cave Research Association mapped it in 2009 and confirmed it as the largest known cave passage on Earth by volume. Sections of the main chamber run up to about 200 m high and 150 m wide, and the two dolines are large enough to hold their own patch of rainforest growing on the cave floor below the light shaft.
- Toggle the doline sunlight to show or hide the two jungle-lit skylight openings
- Toggle the river highlight to trace the Rao Thuong river channel
- Read passage length, chamber height and width figures in the panel
- Drag to orbit, scroll or pinch to zoom
- Runs fully in the browser with the vendored three.js engine - no account, no upload
| Figure | Published value |
|---|---|
| Status | largest known cave passage on Earth by volume |
| Main passage length | about 5 km (about 9 km of connected cave system) |
| Chamber height | up to about 200 m in the biggest sections |
| Chamber width | up to about 150 m in the biggest sections |
| Skylights | 2 large dolines (collapsed ceiling sinkholes) with their own jungle |
| River | Rao Thuong river runs through part of the cave, seasonal |
| Rock age | limestone estimated about 2-5 million years old |
| Discovery | found locally in 1990; surveyed by the British Cave Research Association in 2009 |
| Access | limited guided multi-day treks since 2013, capped permits |
For another rock-layer cross-section, open the Grand Canyon 3D Explorer, or for the opposite extreme in depth, walk through the Mariana Trench 3D Explorer.
Everything renders on your device with WebGL. The 3D engine loads once (about 0.7 MB) and is cached.
This is an educational approximation - the passage shape, doline openings, and vertical scale are schematic teaching cues, not survey cave geology.
Frequently Asked Questions
Why is Son Doong called the world's largest cave?
It is the largest known cave passage by volume - sections of its main chamber run up to about 200 m high and about 150 m wide along a passage about 5 km long.
What are the dolines in Son Doong?
Dolines are places where part of the cave ceiling collapsed long ago, opening a skylight. Son Doong has two large dolines, each with its own patch of jungle growing on the cave floor below the light.
When was Son Doong discovered and explored?
A local farmer found the entrance in 1990. The passage was first surveyed by the British Cave Research Association in 2009, which confirmed its size.
Is there a river inside Son Doong?
Yes - the Rao Thuong river runs through part of the cave, and its flow varies with the season.
Where is Son Doong Cave located?
In Phong Nha-Ke Bang National Park, Quang Binh Province, Vietnam, part of the Phong Nha-Ke Bang UNESCO World Heritage Site.
Can visitors go inside Son Doong?
Only through limited guided multi-day treks with capped permits, offered since 2013 - it is not open for casual walk-in visits.
Is this a scientific cave survey model?
No. It is an educational explorer using published figures - the passage shape, doline openings, and vertical scale are schematic teaching cues, not survey cave geology.