HydroBASINS lev08 watershed · #1080094060
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 across 2 countries : Ain Ghoraba, Azails, Beni Bahdel, Beni Boussaid, Beni Smiel +14
Sub-basin area
1 301,2km²
Upstream area
1 301,2km²
Discharge
1,26m³/s
Mean elev.
1 054m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
19 dept-equivalent regions (GADM L2)
- Beni SnousTlemcen · Algeria299.2 km²23.0% of basin
- 246.7 km²19.0% of basin
- 134.2 km²10.3% of basin
- Sidi DjilaliTlemcen · Algeria113.0 km²8.7% of basin
- Sidi MedjahedTlemcen · Algeria103.2 km²7.9% of basin
- 100.9 km²7.8% of basin
- Beni BoussaidTlemcen · Algeria96.1 km²7.4% of basin
- Ain GhorabaTlemcen · Algeria79.7 km²6.1% of basin
11 moreFull L2 list
- Beni Bahdel43.6 km² · 3.4%
- Terny Beni Hediel26.6 km² · 2.0%
- El Gor20.4 km² · 1.6%
- Bouihi15.7 km² · 1.2%
- Beni Smiel13.4 km² · 1.0%
- El Aricha4.1 km² · 0.3%
- Maghnia1.9 km² · 0.1%
- Oued Chouly1.2 km² · 0.1%
- Sabra1.1 km² · 0.1%
- Hammam Boughrara0.1 km² · 0.0%
- Jerada0.0 km² · 0.0%
4 intersecting protected areas
Tlemcen
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
619.44 km² overlap
Grotte karstique de Ghar Boumâaza
IUCN Not ReportedWetland of International Importance (Ramsar Site)
528.80 km² overlap
Tlemcen
IUCN IINational Park
1.19 km² overlap
Touissit et Ras Asfour
IUCN Not ApplicablePermanent Hunting Reserve
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
387 distinct species · 812 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 24 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 : 16 espèces reliées par 39 interactions GloBI sur 4 types (connectance 14.1%, filtre Serrano α=0.2). 8 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°
14,4°C
Annual rain
501mm
Moisture idx (CMI)
-0,59
Runoff
31mm/an
PET
1 235mm
AET
426mm
Mean slope
8,2°
Water table
627cm
Forest
5%
Crops
64%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)