# Ounasjoki river

The Ounasjoki is a European river flowing through Finland. As of 2026-10-15, the Ounasjoki was flowing at about 115.8 m³/s at the Ounasjoki, Marraskoski gauge.

**Canonical name:** Ounasjoki

**Countries:** Finland

**Maximum upstream drainage area:** 14,454 km²

**Mapped river length:** 79.3 km

**Gauging stations:** 2

**Latest measured discharge:** 115.8 m³/s (Ounasjoki, Marraskoski, 2026-10-15)

## Gauging stations on the Ounasjoki

The following 2 gauging stations report discharge for the Ounasjoki, ordered downstream (largest catchment first). Discharge is in cubic metres per second (m³/s).

| Station | Country | Discharge (m³/s) | Historical Comparison | Observed | Measurement | Data quality | Provider | Lat, Lon | Source |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Ounasjoki, Marraskoski | Finland | 115.8 | Normal — 17% below the historic median | 2026-10-15 | daily mean | SYKE flag 108 | Finnish Environment Institute | 66.794, 25.424 | [source](https://www.syke.fi/en/environmental-data/open-web-services/environmental-data-apis) |
| Ounasjoki, Köngäs | Finland | 36.55 | Normal — 24% below the historic median | 2026-10-15 | daily mean | SYKE flag not supplied | Finnish Environment Institute | 67.878, 24.849 | [source](https://www.syke.fi/en/environmental-data/open-web-services/environmental-data-apis) |

## Related rivers

-   [Vuoksi](/rivers/vuoksi.html)
-   [Ossauskoski](/rivers/ossauskoski.html)
-   [Valajaskoski](/rivers/valajaskoski.html)
-   [Karunki](/rivers/karunki.html)
-   [Kemijoki](/rivers/kemijoki.html)
-   [Pirttikoski](/rivers/pirttikoski.html)
-   [Seitakorva](/rivers/seitakorva.html)
-   [Piirteenvirta](/rivers/piirteenvirta.html)
-   [Merikoski](/rivers/merikoski.html)
-   [Konnivesi](/rivers/konnivesi.html)
-   [Kokemenjoki](/rivers/kokemenjoki.html)
-   [Kolsi](/rivers/kolsi.html)

## Data, sources & timestamps

Geometry is the HydroRIVERS network (HydroSHEDS): European reaches with at least 500 km² of upstream catchment, merged into chains between confluences. Flow direction comes from the network itself; river names are the canonical English label joined from provider metadata and Natural Earth, with local-language aliases retained.

Discharge is normalised observed streamflow from official national hydrology providers, measured where a gauge sits on the river and interpolated between gauges. Pale/estimated values are derived from drainage area × the local specific discharge of nearby gauges and are never presented as measurements.

Underlying dataset built 2026-10-16T13:31:53.036165+00:00. This page generated 2026-10-16T13:35:10.972Z. Discharge values carry their own observation dates in the table above.

[Explore the Ounasjoki on the interactive map →](/)