HydroBASINS lev08 watershed · #1080092220
Bassin de Oued Tafna
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 19 administrative regions : Ain Fettah, Ain Ghoraba, Ain Kebira, Ain Youcef, Beni Mester +14
Sub-basin area
986,6km²
Upstream area
4 957km²
Discharge
4,33m³/s
Mean elev.
439m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Oued Tafna1301 km²
- Bassin de Oued Mouillah9 km²
19 dept-equivalent regions (GADM L2)
- 167.9 km²17.0% of basin
- Beni OuarsousTlemcen · Algeria119.7 km²12.1% of basin
- Ouled RiyahTlemcen · Algeria91.2 km²9.2% of basin
- Beni MesterTlemcen · Algeria86.8 km²8.8% of basin
- Ain FettahTlemcen · Algeria75.9 km²7.7% of basin
- FellaouceneTlemcen · Algeria74.2 km²7.5% of basin
- 66.9 km²6.8% of basin
- Ain KebiraTlemcen · Algeria62.6 km²6.3% of basin
11 moreFull L2 list
- Remchi54.2 km² · 5.5%
- Zenata53.6 km² · 5.4%
- Hammam Boughrara52.9 km² · 5.4%
- Bouhlou27.8 km² · 2.8%
- Mansourah21.8 km² · 2.2%
- Terny Beni Hediel14.1 km² · 1.4%
- Ain Youcef10.1 km² · 1.0%
- Tlemcen5.4 km² · 0.5%
- Nedroma0.8 km² · 0.1%
- Maghnia0.4 km² · 0.0%
- Ain Ghoraba0.3 km² · 0.0%
3 intersecting protected areas
Tlemcen
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
57.09 km² overlap
Tlemcen
IUCN IINational Park
34.72 km² overlap
Grotte karstique de Ghar Boumâaza
IUCN Not ReportedWetland of International Importance (Ramsar Site)
0.13 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
267 distinct species · 463 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 Tafna : 23 espèces reliées par 75 interactions GloBI sur 5 types (connectance 10.7%, filtre Serrano α=0.2). 15 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°
16,9°C
Annual rain
456mm
Moisture idx (CMI)
-0,63
Runoff
28mm/an
PET
1 219mm
AET
388mm
Mean slope
6,6°
Water table
618cm
Forest
8%
Crops
46%
Urban
7%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)