HydroBASINS lev08 watershed · #5080133640
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
659,8km²
Upstream area
659,8km²
Discharge
36,65m³/s
Mean elev.
998m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 649.9 km²98.9% of basin
- 7.0 km²1.1% of basin
1 intersecting protected areas
Kayan Mentarang
IUCN IINational Park
547.22 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 distinct species · 3 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°
21,5°C
Annual rain
3 777mm
Moisture idx (CMI)
0,65
Runoff
1 777mm/an
PET
1 337mm
AET
1 337mm
Mean slope
13,5°
Water table
341cm
Forest
100%
Crops
9%
Urban
0%
Protected
57%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)