HydroBASINS lev08 watershed · #4080014630
Bassin de Sông Ba Chẽ
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 : Ba Chẽ, Cẩm Phả, Hoành Bồ, Sơn Động, Tiên Yên +1
Sub-basin area
992,1km²
Upstream area
992,1km²
Discharge
21,74m³/s
Mean elev.
203m
Administrative coverage
6 dept-equivalent regions (GADM L2)
- Ba Chẽ605.6 km²61.2% of basin
- 226.4 km²22.9% of basin
- 106.4 km²10.7% of basin
- 33.8 km²3.4% of basin
- 11.8 km²1.2% of basin
- 5.5 km²0.6% of basin
2 intersecting protected areas
Dong Son-Ky Thuong
IUCN Not ReportedNature Reserve
71.75 km² overlap
Tay Yen Tu
IUCN IVNature Reserve
1.99 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
133 distinct species · 180 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Ba Chẽ : 33 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 27 interactions GloBI sur 4 types (connectance 4.5%, 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°
22,5°C
Annual rain
1 970mm
Moisture idx (CMI)
0,36
Runoff
898mm/an
PET
1 241mm
AET
1 056mm
Mean slope
11,9°
Water table
425cm
Forest
2%
Crops
9%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)