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 long
Also 3,362 mi
Approximate river-system length · approximate
Typical recorded range: 5,350 km to 5,470 km.
A little perspective
About the same scale as Ganymede.
Ganymede: Ganymede is a natural satellite of Jupiter and contains a magnetic field generated by its partially liquid core.
Measurements, assumptions & sources +
Ob–Irtysh system
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
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.
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Why this measurement?
Why we use 5,410 km
For comparison, this page uses approximate river-system length. This is labelled approximate; the central value is useful for comparison, while real values or measurement solutions can vary. 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 named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
Ob–Irtysh system dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 5,410 km | 5,350 km to 5,470 km | approximate |
Around this scale
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These links use compatible length records, ordered around the selected value.
Nearest lower value · PlacesLena4,400 kmThe Lena is a major river in eastern Siberia, Russia, flowing from the Baikal Mountains to the Laptev Sea.Around the same scale · 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.Nearest higher value · PlacesYenisei5,539 kmThe 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.