The Great Barrier Reef off Queensland, Australia is not one solid wall of coral - it is a dense field of over 2,900 separate reefs and 900+ islands strung along the edge of the continental shelf. Toggle the coral bleaching view to see reef color change under heat stress, or switch on the Heart Reef marker over a well-known individual reef.
Published figures: about 2,300 km long along the Queensland coast, covering about 344,400 sq km; made up of over 2,900 individual reefs and 900+ islands and cays; the lagoon between the coast and the reef is commonly 35-40 m deep.
Drag to orbit and scroll or pinch to zoom. Everything renders on your device with WebGL.
Great Barrier Reef 3D Explorer
This browser explorer shows the Great Barrier Reef the way it actually forms - not a single wall of coral, but a dense, patchy field of individual reefs and channels running along the edge of the Queensland continental shelf. A shallow lagoon separates the reef from the mainland coast, and beyond the reef the shelf drops steeply into the open Coral Sea. Toggle the coral bleaching view to see how reef color shifts under heat stress, or switch on the Heart Reef marker over a well-known individual reef near the Whitsunday Islands.
The reef system runs about 2,300 km along the Queensland coast and covers roughly 344,400 sq km - large enough that it is often described as the only living structure visible from space. It is made up of more than 2,900 separate reefs and over 900 islands and cays, not one continuous barrier, which is why the scene shows open channels between reef patches rather than a solid ridge. Rising ocean temperatures have triggered several mass coral bleaching events on the reef, documented in 2016, 2017, 2020, and 2022.
- Toggle the coral bleaching view to compare healthy reef coloring with a pale, bleached look
- Toggle the Heart Reef marker to highlight a well-known individual reef
- Read length, area, reef count, and lagoon depth 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 |
|---|---|
| Length | about 2,300 km along the Queensland coast |
| Area | about 344,400 sq km |
| Individual reefs | over 2,900 |
| Islands and cays | 900+ |
| Lagoon depth | commonly about 35-40 m |
| UNESCO status | World Heritage Site since 1981 |
| Recent bleaching events | 2016, 2017, 2020, 2022 |
| Location | off the coast of Queensland, Australia |
For another shallow, life-dense water body with a very different profile, open the Lake Victoria 3D Explorer, or compare a marine basin under environmental stress in the Black Sea 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 reef pattern, lagoon, and vertical scale are schematic teaching cues, not survey data.
Frequently Asked Questions
How big is the Great Barrier Reef?
It runs about 2,300 km along the Queensland coast and covers roughly 344,400 sq km, made up of more than 2,900 individual reefs and over 900 islands and cays rather than one continuous structure.
Is the Great Barrier Reef one continuous wall of coral?
No - it is a dense field of separate reef patches with open channels between them, which is why the scene shows scattered reefs rather than a solid ridge.
Can you really see the Great Barrier Reef from space?
Its scale is often cited as making it the only living structure visible from space, given its size and the color contrast of shallow reef water against the surrounding ocean.
What is coral bleaching?
Coral bleaching happens when ocean heat stress causes coral to expel the algae that give it color and much of its food, turning the coral pale or white. The reef has had several documented mass bleaching events, including 2016, 2017, 2020, and 2022.
What is Heart Reef?
Heart Reef is a small, naturally heart-shaped individual reef near the Whitsunday Islands, well known as an aerial photography landmark within the wider reef system.
Is this a scientific terrain model?
No. It is an educational explorer using published figures - the reef pattern, lagoon, and vertical scale are schematic teaching cues, not survey data.