HydroBASINS lev08 watershed · #4081054140
Bassin de Nậm Nơn
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 4 administrative regions across 2 countries : Kỳ Sơn, Quế Phong, Tương Dương, Xamtay
Sub-basin area
851,1km²
Upstream area
8 376,6km²
Discharge
124,75m³/s
Mean elev.
641m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Nậm Nơn247 km²
- Bassin de Nậm Nơn119 km²
4 dept-equivalent regions (GADM L2)
- 632.0 km²74.5% of basin
- 200.8 km²23.7% of basin
- 10.2 km²1.2% of basin
- 5.5 km²0.6% of basin
1 intersecting protected areas
Western Nghe An
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
843.41 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
7 distinct species · 10 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°
21,7°C
Annual rain
1 258mm
Moisture idx (CMI)
-0,09
Runoff
608mm/an
PET
1 384mm
AET
913mm
Mean slope
20,5°
Water table
677cm
Forest
5%
Crops
6%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)