HydroBASINS lev08 watershed · #4081008750
Bassin de Sông Chảy
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 across 2 countries : Bảo Thắng, Bảo Yên, Bắc Hà, Honghe Hani and Yi, Lục Yên +7
Sub-basin area
2 328,5km²
Upstream area
5 156,9km²
Discharge
182,53m³/s
Mean elev.
521m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de 大梁子河1145 km²
- Bassin de 斋河 Sông Chảy100 km²
12 dept-equivalent regions (GADM L2)
- 637.5 km²27.4% of basin
- 598.0 km²25.7% of basin
- 557.7 km²24.0% of basin
- Mường KhươngLào Cai · Vietnam211.9 km²9.1% of basin
- Si Ma CaiLào Cai · Vietnam141.5 km²6.1% of basin
- Quang BìnhHà Giang · Vietnam64.1 km²2.8% of basin
- 55.9 km²2.4% of basin
- 50.2 km²2.2% of basin
4 moreFull L2 list
- Honghe Hani and Yi2.4 km² · 0.1%
- Văn Yên1.6 km² · 0.1%
- Xín Mần1.5 km² · 0.1%
- Wenshan Zhuang and Miao0.1 km² · 0.0%
1 intersecting protected areas
Thac Ba
IUCN VCultural and Historical Site
2.71 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
258 distinct species · 614 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Chảy : 29 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 37 interactions GloBI sur 5 types (connectance 5.6%, filtre Serrano α=0.2). 8 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°
21,4°C
Annual rain
1 708mm
Moisture idx (CMI)
0,24
Runoff
1 091mm/an
PET
1 294mm
AET
1 084mm
Mean slope
16,0°
Water table
567cm
Forest
2%
Crops
12%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)