Seybouse River

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Seybouse (وادي سيبوس)
GM Seybouse01.jpg
The Seybouse in Guelma Province, Algeria
Origin Medjez Amar, Tell Atlas Algeria
Mouth Mediterranean Sea, near Annaba, Algeria
Basin countries Algeria
Length 225 km (140 mi)
Source elevation 0
Avg. discharge 11,5 m³/s (406 ft/s) at Guelma and Annaba
Basin area 6,471 km² (2,498 mi²)

Seybouse (Arabic: وادي سيبوسOued Seybouse) is a river in northeastern Algeria, near the border with Tunisia. In Roman times, it was called the Ubus.


The river runs for about 225 kilometres (140 mi), flowing through Guelma and Annaba Provinces. It starts in Medjez Amar, in the Tell Atlas north-west of Guelma Province. Its flows into the Mediterranean Sea at Seybouse (called Joannonville under French rule) to the south-east of the city of Annaba.[1] Its mouth is just just north of Sidi Salem, the site of Hippo Regius where Saint Augustine lived in AD 391–430.

The Seybouse is used for irrigation of agricultural areas, but it is becoming polluted because of industrial activities.[2]


(As of 1998; source: ANRH)
Element Amount
Flow 11.5 m³/s
Temperature 21.41°C
pH 8.21
Oxygen saturation 36.61%
DBO1 18.33
DCO² 124.3
Nitrates (NO3) 5.58
PO4−3 2.29
Ammonium 9.18


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Coordinates: 36°52′01″N 7°46′18″E / 36.86694°N 7.77167°E / 36.86694; 7.77167