HydroBASINS lev08 watershed · #4080998190
Bassin de Sông Gâm
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 12 administrative regions : Bảo Lâm, Bảo Lạc, Bắc Mê, Bắc Quang, Chiêm Hóa +7
Sub-basin area
2 460,7km²
Upstream area
10 572,9km²
Discharge
274,45m³/s
Mean elev.
607m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Sông Gâm203 km²
- Bassin de Sông Nho Quế97 km²
12 dept-equivalent regions (GADM L2)
2 intersecting protected areas
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
379 distinct species · 969 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 Sông Gâm : 26 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 18 interactions GloBI sur 3 types (connectance 4.8%, filtre Serrano α=0.2). 2 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°
20,9°C
Annual rain
1 712mm
Moisture idx (CMI)
0,24
Runoff
1 034mm/an
PET
1 294mm
AET
1 074mm
Mean slope
20,0°
Water table
730cm
Forest
5%
Crops
7%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)