HydroBASINS lev08 watershed · #5080130280
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 3 administrative regions across 2 countries : Belaga, Malinau, Marudi
Sub-basin area
278km²
Upstream area
278,1km²
Discharge
10,37m³/s
Mean elev.
1 313m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 250.8 km²90.6% of basin
- 25.7 km²9.3% of basin
- 0.3 km²0.1% of basin
1 intersecting protected areas
Kayan Mentarang
IUCN IINational Park
275.35 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°
20,0°C
Annual rain
3 417mm
Moisture idx (CMI)
0,63
Runoff
1 239mm/an
PET
1 269mm
AET
1 269mm
Mean slope
11,5°
Water table
282cm
Forest
100%
Crops
9%
Urban
0%
Protected
99%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)