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River

Ill

72 km from source to mouth · Austria.

AustriaAustriaFlows into Rhine8th longest in Austria

Follow the riverMonth by month

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

In numbers

Length

72km

Average flow

210m³/s

Basin

1,281km²

Drop

599m

from 1,023 m to 424 m

Country

1

The journey

From source to mouth

72 km of river and 29 stops on the way: 22 towns and cities on its banks, dams, bridges and the tributaries that feed it.

1,023 m424 m
Ill Ursprungat 1,023 m0 km
Sankt Gallenkirch1,465 people12 km
Schruns3,818 people22 km
Litztributary23 km
Alfenztributary35 km
Bludenz15,102 people37 km
Bludesch2,386 people47 km
Nenzing4,357 people48 km
Frastanz6,670 people58 km
Feldkirch33,420 people61 km
Rhineat 424 m72 km
020406072 km
  1. 0 kmIll Ursprungat 1,023 m
  2. 5 kmGaschurn1,091 people
  3. 10 kmwooden bridge in Sankt Gallenkirch
  4. 12 kmSankt Gallenkirch1,465 people
  5. 17 kmHolzbrücke Tschagguns
  6. 22 kmSchruns3,818 people
  7. 22 kmTschagguns2,195 people
  8. 23 kmBartholomäberg2,341 people
  9. 23 kmLitztributary
  10. 28 kmVandans2,636 people
  11. 35 kmAlfenztributary
  12. 37 kmBludenz15,102 people
  13. 38 kmBürs3,275 people
  14. 39 kmNüziders4,962 people
  15. 43 kmThüringen2,222 people
  16. 47 kmBludesch2,386 people
  17. 48 kmNenzing4,357 people
  18. 50 kmSchlins2,404 people
  19. 54 kmSatteins2,703 people
  20. 57 kmGöfis3,312 people
  21. 58 kmFrastanz6,670 people
  22. 61 kmFeldkirch33,420 people
  23. 61 kmWasserturm
  24. 61 kmMontfortbruecke
  25. 62 kmIm Kehr 2
  26. 64 kmGisingen8,972 people
  27. 64 kmNofels4,031 people
  28. 70 kmRüthi1,945 people
  29. 72 kmMeiningen2,245 people
  30. 72 kmOberriet7,675 people
  31. 72 kmRhineat 424 m

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

River in Vorarlberg

At the mouth it carries 206 m³/s on average: an Olympic pool every 12 seconds. It drops from 1,023 m to 424 m, 8.3 m per kilometre on average. Its basin covers 1,281 km², about the size of MQ. 341,000 people live in it. Highest water: from March to May; lowest: January. Its dams hold back little of its water (8.3% of a year's flow).

Read more on Wikipedia

Where to start

Ill, month by month

Highest water: from March to May

Lowest water: January. Best months to visit: from June to September.

56
-1°70 mmJan
130
0°62 mmFeb
410
4°66 mmMar
450
8°87 mmApr
400
12°107 mmMay
320
15°132 mmJun
340
17°132 mmJul
380
17°141 mmAug
350
14°103 mmSep
300
9°76 mmOct
260
4°79 mmNov
140
0°79 mmDec
Water (estimated flow)Air (average) Rain (mm)Best months

From about 56 m³/s in the lowest month to 450 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 ACH airport (St. Gallen)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

Ill: the basin in numbers

6,153 km² of land send their water to this river. This is what lives on it.

Lightly regulatedReservoirs can hold 8.3% of a year's flow.
  • 341,000people live in the basin
  • 55/km²people per km²
  • 1,785maverage altitude of the basin
  • 1,385mmof rain a year (basin average)
  • 2.6°Caverage air temperature
  • 9%protected areas
  • 0.2%covered by lakes
  • 1%glaciers
  • 6%permafrost
  • 0.5km³held in reservoirs

What covers the basin

  • 66% Forest
  • 9% Cropland
  • 34% Pasture
  • 4% Towns and cities
  • 1% Ice

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

Ill: what you find on the way

  • 11Dams
  • 117WeirsBrunnenfelder Wehr and 116 more
  • 9WaterfallsBalbierfall and 8 more
  • 1River beachesFreizeit- und Erholungsanlage Paspels

From OpenStreetMap, within 1.7 km of the river. Not mapped is not the same as not there.

Cross-checked with our atlases

Ill 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.

  • 250mountains at the sourcePeakyas

Mountains at the source (250)

Within 15 km of the source, by Peakyas

  1. Piz Buin2.8 km away · prominence 544 m3,312m
  2. Piz Linard8.3 km away · prominence 1,028 m3,411m
  3. Dreiländerspitze3.4 km away · prominence 306 m3,197m
  4. Silvrettahorn1.7 km away · prominence 201 m3,244m
  5. Fluchthorn9.4 km away3,397m
  6. Piz Fliana4.7 km away · prominence 428 m3,298m
  7. Augstenberg7.2 km away · prominence 432 m3,230m
  8. Verstanclahorn4.7 km away · prominence 371 m3,298m

242 more on PeakyasOpen Peakyas ↗

From space

The source and the mouth, seen from orbit

Ill: satellite view of the source
The source14 km across
Ill: satellite view of the mouth
The mouth11 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

Ill in pictures

Ill Feldkirch-Gisingen
Welleschik · CC BY-SA 3.0
Feldkirch Reichenfeldgasse 7, Landeskonservatorium für Vorarlberg
Feel free to use my photos, but please mention me as the author and if you want send me a · CC BY-SA 3.0 at
1993-08-15 Österreich Vorarlberg Feldkirch Veitskapfgasse a
Lothar Weber · CC BY-SA 4.0
Feldkirch (Vorarlberg) - Marktplatz, Hochwassermarke 15.06.1910 (01-2)
Norbert Kaiser · CC BY-SA 3.0 at

Tributaries

Where it flows, and what flows into it

It flows into

RhineThe NetherlandsThe Netherlands1,233 km2,200 m³/s

Tributaries (7)

Also: Alfenz, Litz, Meng, Galina, Lutz, Verbellabach, Rellsbach

In the same basin

MoselleGermanyGermany544 km320 m³/sMainGermanyGermany524 km200 m³/sAareSwitzerlandSwitzerland295 km560 m³/sNeckarGermanyGermany362 km140 m³/sLahnGermanyGermany242 km54 m³/sRuhrGermanyGermany217 km79 m³/sSaarGermanyGermany246 km78 m³/sLippeGermanyGermany255 km240 m³/sReussSwitzerlandSwitzerland159 km130 m³/sIllFranceFrance217 km54 m³/s

Nearby

Rivers nearby

AareSwitzerlandSwitzerland295 km560 m³/s107 km awayLinthSwitzerlandSwitzerland37 km55 m³/s50 km awayVorderrheinSwitzerlandSwitzerland76 km58 m³/s55 km awayThurSwitzerlandSwitzerland135 km47 m³/s80 km awayReussSwitzerlandSwitzerland159 km130 m³/s103 km awayLimmatSwitzerlandSwitzerland140 km100 m³/s103 km awayIllerGermanyGermany147 km90 m³/s124 km awayBregGermanyGermany49 km9.7 m³/s106 km away

Where these numbers come from

Name, length, placesWikidata (Q688454) · 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 atlasesPeakyas — 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