Dja (river)

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Ngoko (in the lower reaches)
The northern catchment area of ​​the Sangha with the Dja (bottom left)

The northern catchment area of ​​the Sangha with the Dja (bottom left)

location CameroonCameroon Cameroon
Region of Est and South Republic of Congo
Congo RepublicRepublic of the Congo 
River system Congo
Drain over Ngoko  → Sangha  → Congo  → Atlantic
source southeast of Abong-Mbang , approximately:
3 ° 40 ′ 0 ″  N , 13 ° 35 ′ 0 ″  E
Source height 760  m
confluence near Moloundou with the Boumba to Ngoko Coordinates: 2 ° 2 ′ 5 "  N , 15 ° 11 ′ 37"  E 2 ° 2 ′ 5 "  N , 15 ° 11 ′ 37"  E
Mouth height 350  m
Height difference 410 m
Bottom slope 0.41 ‰
length 990 km (including Ngoko)
Discharge at gauge Ngbala (1448050)
A Eo : 38,600 km²
Location: about 50 above the mouthdep1
NNQ (min. Month Ø)
MNQ 1954–1978
MQ 1954–1978
Mq 1954–1978
MHQ 1954–1978
HHQ (max. Month Ø)
91 m³ / s
183 m³ / s
420 m³ / s
10.9 l / (s km²)
924 m³ / s
1610 m³ / s
Left tributaries Long, Makoum, Myin, Edje
Right tributaries Mey, Ndjou, Lobo , Afamba, Libii, Menyii, Momo, Mye
The dja

The dja

The Dja (outdated Jah ) is a river in Central Africa.


The Dja, like the Nyong and the Boumba , has its sources in a dense network of rivers a few kilometers southeast of the city of Abong-Mbang in a swamp area in the rainforest. It has only a very slight gradient in the upper reaches. It describes a wide arc to the west into the Sud region , until it makes a 180 ° turn to the south. This is where the Lobo flows, which in its headwaters overlaps with the Soo, a tributary of the Nyong. The gradient also increases here. It flows further east. In the lower reaches there are several rapids and the 29 meter high Nki Falls . It finally unites with the Boumba at Moloundou and from then on is referred to as Ngoko in most sources.


In the catchment area of ​​the Dja, there is the Dja wildlife reserve in the loop , and the Boumba-Bek National Park at the mouth of the Boumba .

River history

The mouth of the Lobe (left) in the Dja

There is a theory that the dja did not once drain into the Congo. The original course followed the current Lobo tributary and its tributary the Mintele to the place Abangok, 8 km northwest of Zoétélé , where the watershed is today. From there over the Awout, a tributary of the Soo , to the Nyong . This had increased the catchment area of ​​the Nyong by 10,000 km². The sudden change of direction of the Dja at the mouth of the Lobo and the subsequent slope are indications that speak for it. In the meantime, the Mekin power plant was built shortly after the estuary .


Sometimes the lower reaches of the Dja on the border with the Republic of Congo is called Ngoko, or the entire course of the river up to the confluence with the Sangha (at 1 ° 39 ′ 6 ″  N , 16 ° 3 ′ 20 ″  E ) is called Dja.


The flow rate of the river was measured for 24 years (1954–1978) in Ngbala, about 50 km above the confluence with the Boumba in m³ / s.

Individual evidence

  1. a b c d PDF on the hydrology of Cameroon (French) Accessed July 25, 2018
  2. a b Homepage UNH / GRDC - Der Dja in Ngbala Accessed on December 27, 2015
  3. ^ Deutsches Kolonial-Lexikon (1920), search term Dscha