Loch Ness is a long, remarkably straight trough occupying part of the Great Glen Fault. Toggle the depth marker to see how far the dark, peat-stained water really drops, and the fault-line marker to see the geological line the loch sits in continue well past both ends of the loch itself.
Published figures: length about 37 km (23 miles); maximum depth about 230 m (755 ft); average depth about 132 m (433 ft); the loch alone holds more fresh water than all the lakes of England and Wales combined.
Drag to orbit and scroll or pinch to zoom. Everything renders on your device with WebGL.
Loch Ness 3D Explorer
This browser explorer shows Loch Ness as a cross-section of a straight fault-line trough: steep granite hillsides on both banks, a long near-uniform underwater bowl, and two toggleable markers - one showing how far the true floor lies below the dark surface, and one showing the geological fault line the loch sits in continuing well past both ends of the loch itself.
Loch Ness occupies part of the Great Glen Fault, a geological fault line that slices diagonally across the Scottish Highlands. Unlike a winding fjord or a round volcanic caldera, the loch is remarkably straight and narrow for its length - about 37 km (23 miles) long but only about 1.6 km (1 mile) wide on average. The water is heavily stained by peat washed in from the surrounding hills, which limits visibility to just a few meters even though the true floor drops to about 230 m (755 ft) at its deepest sounding. Between the depth and the length, Loch Ness alone holds more fresh water than all the lakes of England and Wales combined.
- Toggle the max-depth marker to see the 230 m drop to the loch floor
- Toggle the Great Glen Fault line to see it run past both ends of the loch
- Read length, depth, width, and volume 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 37 km (23 miles) |
| Maximum depth | about 230 m (755 ft) |
| Average depth | about 132 m (433 ft) |
| Average width | about 1.6 km (1 mile), narrower at points |
| Surface elevation | about 16 m (52 ft) above sea level |
| Water volume | more fresh water than all the lakes of England and Wales combined |
| Water clarity | heavily peat-stained - visibility often just a few meters |
| Geology | occupies part of the Great Glen Fault across the Scottish Highlands |
For another lake filling a collapsed volcano rather than a fault line, open the Crater Lake 3D Explorer, or see a much larger fault system in the Great Rift Valley 3D Explorer.
The whole Loch Ness trough - the granite hillsides, the underwater bowl, the depth marker, and the fault-line marker - is built and drawn on your own device with WebGL through the site-vendored three.js engine. Orbit the scene to look along the length of the loch, and toggle the markers to compare the shallow visibility depth against the true depth of the trough. Nothing about your visit is uploaded to a server, and the engine loads once (about 0.7 MB) and is then cached.
This is an educational approximation - the trough profile, basin depths, and vertical scale are schematic teaching cues, not survey bathymetry.
Frequently Asked Questions
Why is Loch Ness so straight and narrow?
It fills part of the Great Glen Fault, a geological fault line that runs diagonally across the Scottish Highlands. The loch is one flooded segment of that fault, which is why it is long, narrow, and unusually straight compared to a winding fjord or a round volcanic caldera.
How deep is Loch Ness?
The maximum recorded depth is about 230 m (755 ft), with an average depth of about 132 m (433 ft) - deep enough that the loch alone holds more fresh water than all the lakes of England and Wales combined.
Why is the water so dark?
Peat washed in from the surrounding hills stains the water heavily, limiting visibility to just a few meters even though the loch itself is very deep.
What is the Great Glen Fault?
A major geological fault line that cuts diagonally across the Scottish Highlands. Loch Ness, along with several other lochs in the same line, fills a low-lying section of that fault.
Where is Loch Ness?
In the Scottish Highlands, near the city of Inverness, Scotland.
Is this a scientific terrain model?
No. It is an educational explorer using published figures - the trough profile, basin depths, and vertical scale are schematic teaching cues, not survey bathymetry.