River
Sieg
155 km from source to mouth · Germany.
GermanyFlows into Rhine
In numbers
Length
155km
Average flow
52m³/s
Basin
3,300km²
Drop
221m
from 270 m to 49 m
Country
1
The journey
From source to mouth
155 km of river and 46 stops on the way: 27 towns and cities on its banks, dams, bridges and the tributaries that feed it.
- 0 kmSieg Springat 270 m
- 0 kmObernau-Stausee0.7 km²
- 0 kmNetphen22,972 people
- 13 kmSiegen102,450 people
- 18 kmSiegtalbrücke
- 25 kmMudersbach6,358 people
- 27 kmBrachbach2,458 people
- 33 kmNiederfischbach5,035 people
- 36 kmKirchen9,342 people
- 38 kmBetzdorf10,560 people
- 38 kmAlsdorf1,765 people
- 44 kmScheuerfeld2,166 people
- 44 kmHellertributary
- 45 kmWallmenroth1,261 people
- 46 kmKatzwinkel2,005 people
- 52 kmMittelhof1,130 people
- 58 kmWissen8,547 people
- 59 kmBirken-Honigsessen2,678 people
- 59 kmWisser Bachtributary
- 62 kmRoth1,554 people
- 63 kmNistertributary
- 64 kmEtzbach1,289 people
- 66 kmFürthen1,276 people
- 68 kmHamm (Sieg)3,406 people
- 69 kmBreitscheidt1,041 people
- 69 kmPracht1,562 people
- 79 kmSiegfall
- 92 kmEisenbahnbrücke über die Sieg bei Herchen
- 102 kmEitorf19,761 people
- 112 kmEisenbahnbrücke über die Sieg bei Bülgenauel
- 115 kmEisenbahnbrücke über die Sieg bei Blankenberg
- 122 kmBröltributary
- 122 kmHanfbachtributary
- 123 kmHennef (Sieg)48,002 people
- 126 kmWahnbach Reservoir1.6 km²
- 127 kmStoßdorf1,739 people
- 131 kmSiegbrücke der A3
- 133 kmWahnbachtributary
- 133 kmSankt Augustin56,094 people
- 134 kmSiegburg39,135 people
- 135 kmSiegbrücke der Stadtbahn
- 140 kmSiegbrücke zwischen Menden und Troisdorf
- 140 kmTroisdorf74,749 people
- 141 kmSiegbruecke der A59
- 141 kmAggertributary
- 148 kmPleisbachtributary
- 149 kmBonn330,579 people
- 155 kmRhineat 49 m
Water level along the river (RiverATLAS; the height is exaggerated). Towns: GeoNames and Wikidata; bridges, dams and tributaries: Wikidata.
River in Germany
At the mouth it carries 52 m³/s on average: an Olympic pool every 48 seconds. It drops from 270 m to 49 m, 1.4 m per kilometre on average. Its basin covers 3,300 km², about the size of CV. 34.9 million people live in it. Highest water: from December to March. Its dams hold back little of its water (3.1% of a year's flow).
Where to start
- BonnLargest city on its banks · 330,579 people
- Cologne Bonn Airport (CGN)Nearest airport with scheduled flights, 15 km from the cityCar hire at CGN airport (Köln)Discover Cars · Affiliate link↗
- On the water37 ferry piers, marinas, boat rentals and boat ramps along the river (OpenStreetMap)
- Kayak and canoe7 put-ins and rapids mapped (OpenStreetMap)
- From May to SeptemberThe best months to visit
Sieg, month by month
Highest water: from December to March
Best months to visit: from May to September.
From about 1,300 m³/s in the lowest month to 3,200 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
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
Sieg: the basin in numbers
143,547 km² of land send their water to this river. This is what lives on it.
- 34.9millionpeople live in the basin
- 246/km²people per km²
- 523maverage altitude of the basin
- 878mmof rain a year (basin average)
- 8.1°Caverage air temperature
- 24%protected areas
- 1.0%covered by lakes
- 2.1km³held in reservoirs
What covers the basin
- 45% Forest
- 22% Cropland
- 17% Pasture
- 15% 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
Sieg: what you find on the way
- 30WeirsWehr Neuwiese, Nisterau Dalex, Wehr Schladern and 27 more
- 3Locks
- 2Waterfalls
- 6Rapids
- 1Canoe put-insEitorf-Zentrum Ein-/Ausstieg Nr.10
- 21Boat rampsWindeck-Au Ein-/Ausstieg Nr. 0,, Bootseinsatzstelle Windeck-Schladern, Windeck-Dattenfeld Ein-/Ausstieg Nr.5 and 18 more
- 7Ferry piersSiegfähre, Fahrgastschiff Anja, Autofähre Mondorf / Christophorus and 4 more
- 7MarinasAm Zehnhoff-Söns, Yachthafen Mondorf, Yacht-Club Pirat Niederkassel (YCPN) and 4 more
- 4River beachesErholungsbereich Aggerwehr, Badestelle Rotter See and 2 more
From OpenStreetMap, within 2.5 km of the river. Not mapped is not the same as not there.
Cross-checked with our atlases
Sieg 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
2lakes on its wayLakeyas
194mountains at the sourcePeakyas
Waterfalls (1)
On the river, by Cascadyas
- Siegfallkm 62
Cascadyas is coming soonOpen Cascadyas ↗
Lakes and reservoirs (2)
Lakes it flows through, by Lakeyas
- Obernau-Stauseekm 00.7km²
- Wahnbach Reservoirkm 991.6km²
Lakeyas is coming soonOpen Lakeyas ↗
Mountains at the source (194)
Within 15 km of the source, by Peakyas
- Ebschloh6.0 km away686m
- Jagd-Berg4.2 km away676m
- Oberste Henn3.8 km away676m
- Riemen12 km away678m
- Eichholzkopf7.8 km away610m
- Pfaffenhain8.3 km away658m
- Eder-Kopf3.4 km away650m
- Großer Ahlertsberg9.1 km away645m
186 more on PeakyasOpen Peakyas ↗
From space
The source and the mouth, seen from orbit
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
Sieg in pictures
Tributaries
Where it flows, and what flows into it
It flows into
Rhine
The Netherlands1,233 km2,200 m³/sTributaries (34)
Also: Agger, Nister, Heller, Bröl, Asdorf, Wisser Bach, Pleisbach, Ferndorfbach, Eipbach, Wahnbach, Hanfbach, Weiß, Ottersbach, Alche, Obernau, Netphe, Schmelzbach, Krabach, Dreisbach, Eisernbach, Holperbach, Irserbach, Grissenbach, Sindernbach
Switzerland
FranceNearby
Rivers nearby
Where these numbers come from
| Name, length, places | Wikidata (Q152484) · CC0 |
|---|---|
| Course, profile, basin | RiverATLAS v1.0 (HydroATLAS, Linke et al. 2019) · CC BY 4.0 — followed from the source to the mouth given by Wikidata |
| Flow | WaterGAP (RiverATLAS), 1971–2000 · CC BY 4.0 |
| Climate along the river | WorldClim (RiverATLAS), 1970–2000 · CC BY 4.0 |
| Towns, bridges, dams | Wikidata · CC0; GeoNames · CC BY 4.0 |
| Along the river | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
| Our other atlases | Cascadyas, Lakeyas, 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.
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