HydroBASINS lev08 watershed · #4081031950

Bassin de Sông Mã

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 6 administrative regions across 2 countries : Mai Sơn, Muang Et, Sông Mã, Sốp Cộp, Xiengkhor +1

Pfafstetter: 44102091

Sub-basin area

879,1km²

Upstream area

6 961,3km²

Discharge

124,16m³/s

Mean elev.

762m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de ນຳ້ມາ850 km²

▲ Receives from 2 basins

Bassin de Nậm Sọi417 km²
Bassin de Sông Mã115 km²

6 dept-equivalent regions (GADM L2)

Sông Mã
Sơn La · Vietnam
372.4 km²
42.5% of basin
Muang Et
Houaphan · Laos
264.5 km²
30.2% of basin
Mai Sơn
Sơn La · Vietnam
213.7 km²
24.4% of basin
Xiengkhor
Houaphan · Laos
21.5 km²
2.5% of basin
Sốp Cộp
Sơn La · Vietnam
4.3 km²
0.5% of basin
Yên Châu
Sơn La · Vietnam
0.3 km²
0.0% of basin

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

4 distinct species · 6 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°

20,7°C

Annual rain

1 422mm

Moisture idx (CMI)

0,03

Runoff

522mm/an

PET

1 382mm

AET

963mm

Mean slope

18,3°

Water table

708cm

Forest

Crops

Urban

Protected

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)