HydroBASINS lev08 watershed · #4080049540
Bassin de Ma 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 11 administrative regions : Horowpothana, Kahatagasdigiliya, Kebithigollewa, Maritimepattu, Medawachchiya +6
Sub-basin area
1 129,9km²
Upstream area
1 129,9km²
Discharge
15,73m³/s
Mean elev.
80m
Administrative coverage
11 dept-equivalent regions (GADM L2)
- 507.3 km²45.1% of basin
- Vavuniya NorthVavuniya · Sri Lanka246.2 km²21.9% of basin
- 162.3 km²14.4% of basin
- 56.9 km²5.1% of basin
- 48.8 km²4.3% of basin
- 31.9 km²2.8% of basin
- 30.8 km²2.7% of basin
- Vavuniya SouthVavuniya · Sri Lanka21.0 km²1.9% of basin
3 moreFull L2 list
- Medawachchiya11.9 km² · 1.1%
- Vavuniya5.0 km² · 0.4%
- Rambewa3.0 km² · 0.3%
10 intersecting protected areas
Paddawiya
IUCN IbReserved Forest
221.65 km² overlap
Periyakattikulam
IUCN IbReserved Forest
100.41 km² overlap
Nainamadu
IUCN IbReserved Forest
52.96 km² overlap
Padaviya Tank
IUCN IVSanctuary
28.83 km² overlap
Karunkaikulam
IUCN IbReserved Forest
21.04 km² overlap
Wedakanda
IUCN IbReserved Forest
8.65 km² overlap
Andankulam
IUCN IbReserved Forest
7.45 km² overlap
Weppankulam
IUCN IbReserved Forest
2.42 km² overlap
Kokkilai
IUCN IVSanctuary
0.08 km² overlap
1 more protected areassorted by overlap area
Gonameriyawa EPA
IUCN IVEnvironmental Protection Area (EPA)
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
145 distinct species · 561 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Ma Oya : 31 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 28 interactions GloBI sur 3 types (connectance 4.7%, 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°
27,4°C
Annual rain
1 511mm
Moisture idx (CMI)
-0,02
Runoff
461mm/an
PET
1 549mm
AET
1 018mm
Mean slope
1,0°
Water table
72cm
Forest
54%
Crops
12%
Urban
0%
Protected
14%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)