Danube
The Danube is a major river in central and eastern Europe, flowing from Germany's Black Forest to the Black Sea.
Also known as: Danube River, River Danube
How big is it?
2,850 km · approximate main-channel length
Also 1,771 mi
Approximate main-channel length · approximate
Typical recorded range: 2,800 km to 2,900 km.
A little perspective
Danube vs Triton: length comparison
The main-channel length of the Danube is about 1.05 times the mean diameter of Triton.
The Danube is a major river in central and eastern Europe, flowing from Germany's Black Forest to the Black Sea.
Triton is a natural satellite of Neptune, with a retrograde orbit and a surface of frozen nitrogen.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
Danube
Approximate main-channel length: 2,850 km; approximate; range 2,800 km–2,900 km.
The Danube is commonly described as approximately 2,850 km long from the Black Forest to the Black Sea. Headwater and channel-centreline conventions affect the total.
Encyclopaedia Britannica — Danube River
The marked approximate main-channel length is calibrated. Unmeasured illustration details are representative.
Triton
Mean diameter: 2,705 km; approximate.
Rounded mean-radius model of Triton. The derived area and volume describe a sphere; surface terrain and flattening are omitted.
NASA JPL — Planetary satellite physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
Use the visual comparison to explore its scale, then check the measurements and sources.
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Why this measurement?
Why we use 2,850 km
We compare the main-channel length of the Danube. This is an estimate; check the notes for its rounding and uncertainty. The recorded range is 2,800 km to 2,900 km.
The Danube is commonly described as approximately 2,850 km long from the Black Forest to the Black Sea. Headwater and channel-centreline conventions affect the total.
The marked horizontal span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 2,850 km | 2,800 km to 2,900 km | approximate |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valuePlaces and natural featuresMurray River2,530 kmApproximate main-channel lengthThe Murray River is a major river in southeastern Australia, flowing from the Snowy Mountains to the Southern Ocean.
Around the same scalePlanets, moons and spaceTriton2,705 kmMean diameterTriton is a natural satellite of Neptune, with a retrograde orbit and a surface of frozen nitrogen.Nearest higher valuePlaces and natural featuresVolga3,530 kmApproximate main-channel lengthThe Volga is a river in central Russia, running from the Valdai Hills to the Caspian Sea.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- Encyclopaedia Britannica — Danube RiverApproximately 2,850 km from the Black Forest to the Black Sea under the cited river convention.
There’s always another scale
Follow your curiosity.
PlacesRhine1,230 kmThe Rhine is a river in western Europe that flows from the Swiss Alps through several countries to the North Sea.PlacesVolga3,530 kmThe Volga is a river in central Russia, running from the Valdai Hills to the Caspian Sea.SpaceTriton2,705 kmTriton is a natural satellite of Neptune, with a retrograde orbit and a surface of frozen nitrogen.
SpaceEuropa3,122 kmEuropa is a natural satellite of Jupiter, with a smooth icy surface thought to cover a subsurface ocean.
SpacePluto2,377 kmPluto is a dwarf planet in the Kuiper Belt, composed of rock and ice and orbiting the Sun.
SpaceMoon3,475 kmThe Moon is Earth’s natural satellite and the brightest large object in Earth’s night sky.
SpaceIo3,643 kmIo is a natural satellite of Jupiter, covered with active volcanoes and sulphur deposits.PlacesMurray River2,530 kmThe Murray River is a major river in southeastern Australia, flowing from the Snowy Mountains to the Southern Ocean.