HydroBASINS lev08 watershed · #5080019870
Bassin de Sungai Simandalan
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 2 administrative regions across 2 countries : Nunukan, Tawau
Sub-basin area
654,5km²
Upstream area
654,5km²
Discharge
4,75m³/s
Mean elev.
41m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 354.2 km²54.4% of basin
- Nunukan238.1 km²36.5% of basin
1 intersecting protected areas
Tawau
IUCN IaForest Reserve
41.14 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
160 distinct species · 215 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 21 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 Sungai Simandalan : 19 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 19 interactions GloBI sur 3 types (connectance 9.0%, 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°
26,8°C
Annual rain
2 111mm
Moisture idx (CMI)
0,29
Runoff
907mm/an
PET
1 507mm
AET
1 487mm
Mean slope
3,0°
Water table
113cm
Forest
40%
Crops
37%
Urban
2%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)