HydroBASINS lev08 watershed · #4081155590
Bassin de Malwathu Oya
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 : Maha Vilachchiya, Vengalacheddiculam
Sub-basin area
127,1km²
Upstream area
2 212,5km²
Discharge
26,6m³/s
Mean elev.
59m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Malwathu Oya966 km²
- Bassin de Malwathu Oya709 km²
2 dept-equivalent regions (GADM L2)
- 81.6 km²64.5% of basin
- VengalacheddiculamVavuniya · Sri Lanka44.9 km²35.5% of basin
2 intersecting protected areas
Wilpattu
IUCN IINational Park
52.19 km² overlap
Periyachipplkulam
IUCN IbReserved Forest
1.07 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
150 distinct species · 928 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 Malwathu Oya : 30 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 32 interactions GloBI sur 3 types (connectance 5.7%, filtre Serrano α=0.2). 4 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°
27,5°C
Annual rain
1 270mm
Moisture idx (CMI)
-0,18
Runoff
329mm/an
PET
1 554mm
AET
956mm
Mean slope
0,7°
Water table
64cm
Forest
59%
Crops
7%
Urban
0%
Protected
41%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)