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River

Mara River

395 km from source to mouth · Tanzania and Kenya.

TanzaniaKenyaTanzania and KenyaFlows into Lake Victoria7th longest in Tanzania

Follow the riverMonth by month

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

In numbers

Length

395km

Average flow

18m³/s

Basin

13,504km²

Drop

1,368m

from 2,502 m to 1,134 m

Countries

2

The journey

From source to mouth

395 km of river and 2 stops on the way: 1 towns and cities on its banks, dams, bridges and the tributaries that feed it.

2,502 m1,134 m
Sourceat 2,502 m0 km
Mulot3,149 people74 km
Lake Victoriaat 1,134 m395 km
0100200300395 km
  1. 0 kmSourceat 2,502 m
  2. 74 kmMulot3,149 people
  3. 385 kmKirumi Bridge
  4. 395 kmLake Victoriaat 1,134 m

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

River in Kenya and Tanzania

At the mouth it carries 18 m³/s on average: an Olympic pool every 139 seconds. It drops from 2,502 m to 1,134 m, 3.5 m per kilometre on average. Its basin covers 13,504 km², about the size of BS. 978,000 people live in it. Highest water: from April to May; lowest: from August to October. No large dam holds it back: it is one of the world's free-flowing rivers.

Read more on Wikipedia

Where to start

Mara River, month by month

Highest water: from April to May

Lowest water: from August to October. Best months to visit: from June to October.

18
21°75 mmJan
17
22°92 mmFeb
19
22°126 mmMar
26
21°180 mmApr
26
21°115 mmMay
21
20°62 mmJun
13
20°30 mmJul
11
20°47 mmAug
11
20°59 mmSep
12
21°68 mmOct
16
21°114 mmNov
18
21°104 mmDec
Water (estimated flow)Air (average) Rain (mm)Best months

From about 11 m³/s in the lowest month to 26 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

Mara River: the basin in numbers

13,606 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.
  • 978,000people live in the basin
  • 72/km²people per km²
  • 1,726maverage altitude of the basin
  • 1,056mmof rain a year (basin average)
  • 18.8°Caverage air temperature
  • 37%protected areas

What covers the basin

  • 30% Forest
  • 9% Cropland
  • 35% Pasture
  • 6% 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.

From space

The source and the mouth, seen from orbit

Mara River: satellite view of the source
The source14 km across
Mara River: satellite view of the mouth
The mouth16 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

Mara River in pictures

Western white-bearded wildebeest (Connochaetes taurinus mearnsi) Mara River crossing 1b
Charles J. Sharp · CC BY-SA 4.0
Western white-bearded wildebeest (Connochaetes taurinus mearnsi) Mara River crossing 1a
Charles J. Sharp · CC BY-SA 4.0
Bridges-across-Mara-2012
Bjørn Christian Tørrissen · CC BY-SA 3.0
Riviere mara
"Daniel Fafard ( Dreamdan )" · CC BY-SA 3.0

Where these numbers come from

Name, length, placesWikidata (Q530479) · CC0
Course, profile, basinRiverATLAS v1.0 (HydroATLAS, Linke et al. 2019) · CC BY 4.0 — followed along the river network from the point 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

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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