# Una river

The Una is a European river flowing through Bosnia and Herzegovina. As of 2026-10-16, the Una was flowing at about 39.733 m³/s at the Kostajnica gauge.

**Canonical name:** Una

**Countries:** Bosnia and Herzegovina

**Maximum upstream drainage area:** 6,501 km²

**Mapped river length:** 66 km

**Gauging stations:** 1

**Latest measured discharge:** 39.733 m³/s (Kostajnica, 2026-10-16)

## Gauging stations on the Una

The following gauging station reports discharge for the Una. Discharge is in cubic metres per second (m³/s).

| Station | Country | Discharge (m³/s) | Historical Comparison | Observed | Measurement | Data quality | Provider | Lat, Lon | Source |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Kostajnica | Croatia | 39.733 | — | 2026-10-16 | instantaneous | unverified automatic-gauge data | Sava Hydrological Information System | 45.222, 16.549 | [source](https://savahis.org/) |

## 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 Una on the interactive map →](/)