Ob–Irtysh system
The Ob–Irtysh system is a river network in western Siberia, Russia and Kazakhstan, formed by the Ob River and its main tributary, the Irtysh.
Also known as: Ob-Irtysh system, Ob River system
How big is it?
5,410 km · approximate river-system length
Also 3,362 mi
Approximate river-system length · approximate
Typical recorded range: 5,350 km to 5,470 km.
A little perspective
Ob–Irtysh system vs Ganymede: length comparison
The river-system length of the Ob–Irtysh system is about 1.03 times the mean diameter of Ganymede.
The Ob–Irtysh system is a river network in western Siberia, Russia and Kazakhstan, formed by the Ob River and its main tributary, the Irtysh.
Ganymede is a natural satellite of Jupiter and contains a magnetic field generated by its partially liquid core.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
Ob–Irtysh system
Approximate river-system length: 5,410 km; approximate; range 5,350 km–5,470 km.
The Ob–Irtysh river system is approximately 5,410 km from the Irtysh headwaters to the Gulf of Ob. Headwater and channel-centreline conventions affect the total.
Encyclopaedia Britannica — Ob River
The marked approximate river-system length is calibrated. Unmeasured illustration details are representative.
Ganymede
Mean diameter: 5,262 km; approximate.
Rounded mean-radius model of Ganymede. 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 5,410 km
We compare the river-system length of the Ob–Irtysh system. This is an estimate; check the notes for its rounding and uncertainty. The recorded range is 5,350 km to 5,470 km.
The Ob–Irtysh river system is approximately 5,410 km from the Irtysh headwaters to the Gulf of Ob. 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 |
|---|---|---|---|
| 5,410 km | 5,350 km to 5,470 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 featuresLena4,400 kmApproximate main-channel lengthThe Lena is a major river in eastern Siberia, Russia, flowing from the Baikal Mountains to the Laptev Sea.Around the same scalePlaces and natural featuresYellow River5,464 kmApproximate main-channel lengthThe Yellow River, or Huang He, is a major river in northern China, flowing from the Bayan Har Mountains to the Bohai Sea.Nearest higher valuePlaces and natural featuresYenisei5,539 kmApproximate river-system lengthThe Yenisei is a major river in Siberia, Russia, flowing northwards from Mongolia to the Arctic Ocean.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- Encyclopaedia Britannica — Ob RiverOb–Irtysh system and headwater context; the atlas uses an approximate 5,410 km system length.
There’s always another scale
Follow your curiosity.
PlacesYenisei5,539 kmThe Yenisei is a major river in Siberia, Russia, flowing northwards from Mongolia to the Arctic Ocean.PlacesLena4,400 kmThe Lena is a major river in eastern Siberia, Russia, flowing from the Baikal Mountains to the Laptev Sea.
SpaceGanymede5,262 kmGanymede is a natural satellite of Jupiter and contains a magnetic field generated by its partially liquid core.
SpaceTitan5,150 kmTitan is a natural satellite of Saturn, with a thick nitrogen-rich atmosphere and surface lakes of hydrocarbons.
SpaceMercury4,879 kmMercury is a rocky planet orbiting closest to the Sun in the Solar System.
SpaceCallisto4,821 kmCallisto is a natural satellite of Jupiter, with a heavily cratered icy surface.
SpaceMars6,779 kmMars is a rocky planet orbiting the Sun, with a reddish surface due to iron oxide.PlacesYellow River5,464 kmThe Yellow River, or Huang He, is a major river in northern China, flowing from the Bayan Har Mountains to the Bohai Sea.