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River

Una

207 km from source to mouth · Croatia and Bosnia and Herzegovina.

CroatiaBosnia and HerzegovinaCroatia and Bosnia and HerzegovinaFlows into Sava5th longest in Croatia

Follow the riverMonth by month

SourceMouth
The river and every tributary in its basin, drawn from RiverATLAS (CC BY 4.0).

In numbers

Length

207km

Average flow

200m³/s

Basin

10,400km²

Drop

280m

from 369 m to 89 m

Countries

2

The journey

From source to mouth

207 km of river and 12 stops on the way: 9 towns and cities on its banks, dams, bridges and the tributaries that feed it.

369 m89 m
Sourceat 369 m0 km
Unac Rivertributary15 km
Bihać75,641 people61 km
Bosanska Krupa15,193 people96 km
Novi Grad8,920 people129 km
Sanatributary130 km
Kostajnica4,739 people157 km
Kozarska Dubica9,959 people181 km
Savaat 89 m207 km
050100150207 km
  1. 0 kmSourceat 369 m
  2. 15 kmUnac Rivertributary
  3. 29 kmOrašac3,856 people
  4. 35 kmŠtrbački buk
  5. 61 kmBihać75,641 people
  6. 76 kmOstrožac5,456 people
  7. 96 kmBosanska Krupa15,193 people
  8. 106 kmOtoka6,595 people
  9. 129 kmNovi Grad8,920 people
  10. 130 kmSanatributary
  11. 145 kmDobrljin3,582 people
  12. 157 kmKostajnica4,739 people
  13. 181 kmKozarska Dubica9,959 people
  14. 207 kmSavaat 89 m

Water level along the river (RiverATLAS; the height is exaggerated). Towns: GeoNames and Wikidata; bridges, dams and tributaries: Wikidata.

River in Bosnia and Herzegovina and Croatia

At the mouth it carries 202 m³/s on average: an Olympic pool every 12 seconds. It drops from 369 m to 89 m, 1.4 m per kilometre on average. Its basin covers 10,400 km², about the size of LB. 3.4 million people live in it. Highest water: from December to January. No large dam holds it back: it is one of the world's free-flowing rivers.

Read more on Wikipedia

Where to start

  • BihaćLargest city on its banks · 75,641 people
  • Zadar Airport (ZAD)Nearest airport with scheduled flights, 90 km from the cityCar hire at ZAD airport (Zadar)Discover Cars · Affiliate link
  • On the water1 ferry piers, marinas, boat rentals and boat ramps along the river (OpenStreetMap)
  • Kayak and canoe14 put-ins and rapids mapped (OpenStreetMap)
  • From May to SeptemberThe best months to visit

Una, month by month

Highest water: from December to January

Best months to visit: from May to September.

830
0°72 mmJan
620
2°70 mmFeb
420
6°67 mmMar
380
10°81 mmApr
350
15°88 mmMay
380
18°99 mmJun
270
20°78 mmJul
210
20°80 mmAug
210
16°82 mmSep
410
11°96 mmOct
730
6°114 mmNov
920
2°103 mmDec
Water (estimated flow)Air (average) Rain (mm)Best months

From about 210 m³/s in the lowest month to 920 m³/s in the highest. An estimate: the monthly flow is modelled from the lowest and highest months of WaterGAP (RiverATLAS, 1971–2000) and the rain and snow along the river (WorldClim). Dams change the real rhythm. The chip is the average air temperature; below it, the month's rain.

Plan the trip

Plan the trip: boat trips, a bed by the river, a car

Car hire at ZAD airport (Zadar)Discover CarsSee 

Some links above are affiliate links: if you book through them we may earn a commission, at no extra cost to you. It never changes what the data on this page says.

The basin

Una: the basin in numbers

32,100 km² of land send their water to this river. This is what lives on it.

Free-flowingDams upstream can hold only 0.0% of a year's flow: the river still keeps its natural rhythm.
  • 3.4millionpeople live in the basin
  • 105/km²people per km²
  • 370maverage altitude of the basin
  • 1,073mmof rain a year (basin average)
  • 9.8°Caverage air temperature
  • 17%protected areas
  • 0.3%covered by lakes

What covers the basin

  • 55% Forest
  • 16% Cropland
  • 20% Pasture
  • 5% Towns and cities

RiverATLAS (HydroATLAS v1.0, CC BY 4.0): land cover, people, protected areas, glaciers and dams over the whole basin upstream of the mouth.

Along the river

Una: what you find on the way

  • 9DamsBeton, HE Kostela and 7 more
  • 1Weirs
  • 3Locks
  • 105WaterfallsŠtrbački buk and 104 more
  • 14Rapids
  • 1Boat rentals
  • 8River beachesPiloti, Plaža Piskar, Bravice and 5 more

From OpenStreetMap, within 2.1 km of the river. Not mapped is not the same as not there.

Cross-checked with our atlases

Una in our other atlases

What our sister atlases know about the waterfalls on this river, the lakes it flows through, the beaches at its mouth, the mountains where it rises and the islands off its mouth.

  • 1waterfall on the riverCascadyas
  • 32mountains at the sourcePeakyas

Waterfalls (1)

On the river, by Cascadyas

  1. Štrbački bukkm 3424m

Cascadyas is coming soonOpen Cascadyas ↗

Mountains at the source (32)

Within 15 km of the source, by Peakyas

  1. Veliki Piket15 km away1,098m
  2. Mali Piket14 km away1,079m
  3. Ravna Bobara12 km away996m
  4. Papkovo Brdo13 km away988m
  5. Pekinovac10 km away712m
  6. Sedlarov Vrh15 km away
  7. Grumila13 km away
  8. Sorjak9.7 km away

24 more on PeakyasOpen Peakyas ↗

From space

The source and the mouth, seen from orbit

Una: satellite view of the source
The source14 km across
Una: satellite view of the mouth
The mouth24 km across

Sentinel-2 cloudless 2016 by EOX IT Services GmbH (contains modified Copernicus Sentinel data 2016), CC BY 4.0. The glowing line is the river as drawn by RiverATLAS.

Photos

Una in pictures

Štrbački buk 1
Julian Nyča · CC BY-SA 3.0

Tributaries

Where it flows, and what flows into it

It flows into

SavaSerbiaSerbia945 km1,700 m³/s

Tributaries (3)

SanaBosnia and HerzegovinaBosnia and Herzegovina146 km69 m³/sjoins at km 130

Also: Unac River, Krka

In the same basin

DanubeRomaniaRomania2,850 km5,400 m³/sTiszaSerbiaSerbia966 km800 m³/sDravaCroatiaCroatia720 km620 m³/sInnGermanyGermany517 km740 m³/sPrutMoldovaMoldova953 km120 m³/sIsarGermanyGermany292 km170 m³/sMoravaAustriaAustria388 km110 m³/sDrinaSerbiaSerbia346 km120 m³/sSiret RiverRomaniaRomania740 km230 m³/sOlt RiverRomaniaRomania615 km170 m³/s

Nearby

Rivers nearby

KupaCroatiaCroatia297 km280 m³/s43 km awayVrbasBosnia and HerzegovinaBosnia and Herzegovina240 km33 m³/s47 km awaySanaBosnia and HerzegovinaBosnia and Herzegovina146 km69 m³/s48 km awayMurCroatiaCroatia434 km170 m³/s111 km awayBosnaBosnia and HerzegovinaBosnia and Herzegovina282 km140 m³/s121 km awayDravaCroatiaCroatia720 km620 m³/s159 km awayKoranaCroatiaCroatia144 km86 m³/s111 km awayKrkaSloveniaSlovenia93 km170 m³/s127 km away

Where these numbers come from

Name, length, placesWikidata (Q212927) · CC0
Course, profile, basinRiverATLAS v1.0 (HydroATLAS, Linke et al. 2019) · CC BY 4.0 — followed from the source to the mouth given by Wikidata
FlowWaterGAP (RiverATLAS), 1971–2000 · CC BY 4.0
Climate along the riverWorldClim (RiverATLAS), 1970–2000 · CC BY 4.0
Towns, bridges, damsWikidata · CC0; GeoNames · CC BY 4.0
Along the river© OpenStreetMap contributors · ODbL
ImagesEOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons
Our other atlasesCascadyas, Peakyas — Wikidata · CC0; © OpenStreetMap contributors · ODbL; GeoNames · CC BY 4.0; HydroLAKES · CC BY 4.0; NOAA OISST

Every source and licence is on the data sources page.

The family

Do you prefer beaches, lakes, mountains, waterfalls, islands, rivers or canyons?

Same idea, other landscapes: field atlases built on open data, month by month, in seven languages.

beachesCoastyaFind your beach: sea temperature, sun and swimming month by month.Visit
lakesLakeyasEvery lake on Earth: water temperature, ice, depth and the shore.Coming soonVisit
mountainsPeakyasEvery summit in 3D: summit weather, the 0 °C line, huts and trails.Visit
waterfallsCascadyasEvery waterfall: height, flow month by month and when it roars.Coming soonVisit
islandsIslandyasEvery island from the sea up: size, sea temperature, ferries and 3D.Coming soonVisit
riversRiveryasEvery river from source to sea: the journey, the flow and the basin in numbers.You are here
canyonsCanyonyasEvery canyon cut to scale: depth to the floor, rim and floor temperatures, trails and viewpoints.Coming soonVisit