HydroBASINS lev08 watershed · #5080133650
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 1 administrative regions : Malinau
Sub-basin area
501,8km²
Upstream area
2 240,3km²
Discharge
95,17m³/s
Mean elev.
912m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Sungai Iwan570 km²
- Bassin de Sungai Kian310 km²
1 dept-equivalent regions (GADM L2)
- 499.6 km²100.0% of basin
1 intersecting protected areas
Kayan Mentarang
IUCN IINational Park
416.57 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 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°
22,0°C
Annual rain
3 790mm
Moisture idx (CMI)
0,64
Runoff
1 685mm/an
PET
1 346mm
AET
1 346mm
Mean slope
11,9°
Water table
298cm
Forest
99%
Crops
10%
Urban
0%
Protected
100%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)