River
Blavet
149 km from source to mouth · France.
FranceFlows into Atlantic Ocean
In numbers
Length
149km
Average flow
27m³/s
Basin
1,951km²
Drop
148m
from 148 m to 0 m
Country
1
The journey
From source to mouth
149 km of river and 13 stops on the way: 9 towns and cities on its banks, dams, bridges and the tributaries that feed it.
- 0 kmBourbriacat 148 m
- 6 kmPlounévez-Quintin1,101 people
- 10 kmSaint-Nicolas-du-Pélem1,959 people
- 24 kmGouarec1,081 people
- 44 kmLake Guerlédan2.6 km²
- 56 kmNeulliac1,575 people
- 67 kmPontivy16,752 people
- 73 kmLe Sourn2,008 people
- 74 kmSaint-Thuriau2,000 people
- 106 kmÉveltributary
- 112 kmQuistinic1,337 people
- 140 kmHennebont14,288 people
- 141 kmHennebont Bridge
- 148 kmScorfftributary
- 149 kmAtlantic Oceanat 0 m
Water level along the river (RiverATLAS; the height is exaggerated). Towns: GeoNames and Wikidata; bridges, dams and tributaries: Wikidata.
River in France
At the mouth it carries 27 m³/s on average: an Olympic pool every 94 seconds. It drops from 148 m to 0 m, 1.0 m per kilometre on average. Its basin covers 1,951 km², about the size of MU. 129,000 people live in it. Highest water: from December to January; lowest: from June to August. Its dams hold back little of its water (3.3% of a year's flow).
Where to start
- PontivyLargest city on its banks · 16,752 people
- Rennes-Saint-Jacques Airport (RNS)Nearest airport with scheduled flights, 92 km from the cityCar hire at RNS airport (Saint-Jacques-de-la-Lande, Ille-et-Vilaine)Discover Cars · Affiliate link↗
- On the water14 ferry piers, marinas, boat rentals and boat ramps along the river (OpenStreetMap)
- From June to SeptemberThe best months to visit
Blavet, month by month
Highest water: from December to January
Lowest water: from June to August. Best months to visit: from June to September.
From about 14 m³/s in the lowest month to 95 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
Blavet: the basin in numbers
2,054 km² of land send their water to this river. This is what lives on it.
- 129,000people live in the basin
- 63/km²people per km²
- 148maverage altitude of the basin
- 912mmof rain a year (basin average)
- 10.8°Caverage air temperature
- 0.2%covered by lakes
- 0.1km³held in reservoirs
What covers the basin
- 1% Forest
- 60% Cropland
- 5% Pasture
- 2% 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
Blavet: what you find on the way
- 41WeirsEcluse Saint-Nicolas-des-Eaux and 40 more
- 122LocksCanal de Nantes à Brest, Le Blavet, Canal de Nantes à Brest - Le Blavet Canalisé and 119 more
- 7Boat rampsCale du Ty mor and 6 more
- 5Marinas
From OpenStreetMap, within 1.4 km of the river. Not mapped is not the same as not there.
Cross-checked with our atlases
Blavet 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.
1lake on its wayLakeyas
15beaches at the mouth and on the banksCoastya
1mountain at the sourcePeakyas
8islands off the mouthIslandyas
Lakes and reservoirs (1)
Lakes it flows through, by Lakeyas
- Lake Guerlédankm 32 · 45 m deep2.6km²
Lakeyas is coming soonOpen Lakeyas ↗
Beaches (15)
At the mouth (25 km) and on the banks, by Coastya
- Plage de Toulhars8.5 km away18.3°C
- Plage de Kerguélen10 km away18.3°C
- Plage de Larmor8.9 km away18.3°C
- Plage de Sainte-Barbe22 km away18.3°C
- Plage de Kerhillio20 km away18.3°C
- Plage du Magouëro12 km away18.3°C
- Plage de Bellangenet19 km away18.3°C
- Plage du Kérou20 km away18.3°C
7 more on CoastyaOpen Coastya ↗
Mountains at the source (1)
Within 15 km of the source, by Peakyas
- Ménez Bré15 km away302m
Islands off the mouth (8)
Within 30 km of the mouth, by Islandyas
- Groix18 km away
- Téviec25 km away0.1km²
- île Saint-Michel6.1 km away
- Île de Kerner6.8 km away0.1km²
- Fort-Bloqué16 km away
- îlot de Guernic26 km away
- île Thinic28 km away
- île de Roëlan19 km away
Islandyas is coming soonOpen Islandyas ↗
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
Blavet in pictures
Tributaries
Where it flows, and what flows into it
Tributaries (7)
Also: Scorff, Ével, Daoulas, Sarre, Sullon, Saint-Niel, Brandifrout
Nearby
Rivers nearby
Where these numbers come from
| Name, length, places | Wikidata (Q745809) · 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 | Lakeyas, Coastya, Peakyas, Islandyas — 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.
beaches
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Every summit in 3D: summit weather, the 0 °C line, huts and trails.Visit 
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Every waterfall: height, flow month by month and when it roars.Coming soonVisit islands
Every island from the sea up: size, sea temperature, ferries and 3D.Coming soonVisit 
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Every river from source to sea: the journey, the flow and the basin in numbers.You are here
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Every canyon cut to scale: depth to the floor, rim and floor temperatures, trails and viewpoints.Coming soonVisit