HydroBASINS lev08 watershed · #2080980970
Bassin de وادي اللجام
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 3 administrative regions : Tathlith, Thar, Yadamah
Sub-basin area
947,5km²
Upstream area
947,9km²
Discharge
1,31m³/s
Mean elev.
1 491m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- YadamahNajran · Saudi Arabia699.7 km²74.1% of basin
- 217.6 km²23.0% of basin
- TharNajran · Saudi Arabia27.3 km²2.9% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 distinct species · 1 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Not enough documented interactions to build a meaningful graph for this territory.
Hydroclimate (BasinATLAS lev08)
Mean T°
22,3°C
Annual rain
141mm
Moisture idx (CMI)
-0,92
Runoff
63mm/an
PET
1 851mm
AET
116mm
Mean slope
5,5°
Water table
582cm
Forest
0%
Crops
0%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)