HydroBASINS lev08 watershed · #5080132420
Bassin de Sungai Iwan
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 : Belaga, Malinau
Sub-basin area
569,7km²
Upstream area
1 428km²
Discharge
52,35m³/s
Mean elev.
1 123m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Sungai Iwan290 km²
- Bassin de Sungai Iwan29 km²
2 dept-equivalent regions (GADM L2)
- 559.4 km²98.6% of basin
- 7.7 km²1.4% of basin
1 intersecting protected areas
Kayan Mentarang
IUCN IINational Park
561.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
0 distinct species · 0 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°
21,0°C
Annual rain
3 594mm
Moisture idx (CMI)
0,64
Runoff
1 432mm/an
PET
1 304mm
AET
1 304mm
Mean slope
12,3°
Water table
307cm
Forest
100%
Crops
9%
Urban
0%
Protected
100%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)