HydroBASINS lev08 watershed · #1080031100
Bassin de Oued Bou Namoussa
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 29 administrative regions across 2 countries : Ain El Assel, Ain Kerma, Ain Zana, Asfour, Aïn Draham +24
Sub-basin area
2 762,5km²
Upstream area
2 762,5km²
Discharge
16,92m³/s
Mean elev.
312m
Administrative coverage
29 dept-equivalent regions (GADM L2)
- 216.6 km²7.8% of basin
- Hammam Ben SalahEl Tarf · Algeria200.2 km²7.2% of basin
- 191.9 km²6.9% of basin
- 164.0 km²5.9% of basin
- 161.0 km²5.8% of basin
- 155.1 km²5.6% of basin
- Ben M'HidiEl Tarf · Algeria150.0 km²5.4% of basin
- 115.4 km²4.2% of basin
21 moreFull L2 list
- Fernana114.2 km² · 4.1%
- El Tarf111.4 km² · 4.0%
- Ain Kerma110.6 km² · 4.0%
- Ghardimaou109.5 km² · 4.0%
- Asfour105.3 km² · 3.8%
- El Kala94.8 km² · 3.4%
- Bouhadjar92.2 km² · 3.3%
- Lac Des Oiseaux85.8 km² · 3.1%
- Ain El Assel82.8 km² · 3.0%
- Chihani81.0 km² · 2.9%
- Besbes79.4 km² · 2.9%
- Machroha69.6 km² · 2.5%
- Ain Zana57.5 km² · 2.1%
- Oued Zitoun50.6 km² · 1.8%
- Ouled Driss50.0 km² · 1.8%
- Bouchekouf46.0 km² · 1.7%
- Zerizer30.0 km² · 1.1%
- Raml Souk17.8 km² · 0.6%
- Echatt16.4 km² · 0.6%
- El Aioun4.0 km² · 0.1%
- Medjaz Sfa0.1 km² · 0.0%
11 intersecting protected areas
El Kala
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
439.87 km² overlap
El Kala
IUCN IINational Park
439.87 km² overlap
Marais de la Mekhada
IUCN Not ReportedWetland of International Importance (Ramsar Site)
73.49 km² overlap
Réserve Intégrale du Lac Oubeïra
IUCN Not ReportedWetland of International Importance (Ramsar Site)
24.05 km² overlap
Dj. Ghorra
IUCN Not AssignedNature Reserve
15.81 km² overlap
El Feïja
IUCN Not AssignedNational Park
8.56 km² overlap
Oum Lâagareb
IUCN Not ReportedWetland of International Importance (Ramsar Site)
7.11 km² overlap
Marais de Bourdim
IUCN Not ReportedWetland of International Importance (Ramsar Site)
4.80 km² overlap
Aulnaie de Aïn Khiar
IUCN Not ReportedWetland of International Importance (Ramsar Site)
1.68 km² overlap
2 more protected areassorted by overlap area
Réserve Naturelle du Lac des Oiseaux
IUCN Not ReportedWetland of International Importance (Ramsar Site)
0.82 km² overlap
Tourbière du Lac Noir
IUCN Not ReportedWetland of International Importance (Ramsar Site)
0.10 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 018 distinct species · 4 286 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 30 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de Oued Bou Namoussa : 24 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 43 interactions GloBI sur 2 types (connectance 9.9%, filtre Serrano α=0.2). 6 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
16,7°C
Annual rain
830mm
Moisture idx (CMI)
-0,33
Runoff
246mm/an
PET
1 248mm
AET
645mm
Mean slope
7,3°
Water table
365cm
Forest
71%
Crops
38%
Urban
4%
Protected
18%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)