HydroBASINS lev08 watershed · #4081158250
Bassin de Mahaweli Ganga
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 32 administrative regions : Akurana, Ambagamuwa, Bulathkohupitiya, Delthota, Doluwa +27
Sub-basin area
2 368,4km²
Upstream area
2 368,7km²
Discharge
75,35m³/s
Mean elev.
984m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
32 dept-equivalent regions (GADM L2)
- Nuwara EliyaNuwara Eliya · Sri Lanka389.9 km²16.5% of basin
- HangurankethaNuwara Eliya · Sri Lanka231.3 km²9.8% of basin
- 222.7 km²9.4% of basin
- 189.2 km²8.0% of basin
- 165.3 km²7.0% of basin
- 125.2 km²5.3% of basin
- 120.2 km²5.1% of basin
- 95.7 km²4.1% of basin
24 moreFull L2 list
- Udapalatha89.4 km² · 3.8%
- Panvila88.5 km² · 3.8%
- Pathahewaheta82.4 km² · 3.5%
- Kundasale80.6 km² · 3.4%
- K.F.G. & G. Korale59.5 km² · 2.5%
- Ambagamuwa58.0 km² · 2.5%
- Yatinuwara56.5 km² · 2.4%
- Delthota54.4 km² · 2.3%
- Harispattuwa50.8 km² · 2.2%
- Udunuwara47.7 km² · 2.0%
- Pathadumbara36.0 km² · 1.5%
- Ganga Ihala Korale34.6 km² · 1.5%
- Poojapitiya30.9 km² · 1.3%
- Akurana22.6 km² · 1.0%
- Minipe18.9 km² · 0.8%
- Thumpane3.8 km² · 0.2%
- Ukuwela1.9 km² · 0.1%
- Welimada1.0 km² · 0.0%
- Yatiyanthota0.6 km² · 0.0%
- Laggala-Pallegama0.4 km² · 0.0%
- Mawanella0.1 km² · 0.0%
- Kandaketiya0.1 km² · 0.0%
- Rattota0.0 km² · 0.0%
- Bulathkohupitiya0.0 km² · 0.0%
30 intersecting protected areas
Sanctuary
259.89 km² overlap
Pedro Forest/Pidurutalagala
IUCN IaConservation Forest
69.68 km² overlap
Knuckles
IUCN IaConservation Forest
56.20 km² overlap
Knuckles EPA
IUCN IaEnvironmental Protection Area (EPA)
54.45 km² overlap
Central Highlands of Sri Lanka
IUCN Not ApplicableWorld Heritage Site (natural or mixed)
48.43 km² overlap
Hantana EPA
IUCN VIEnvironmental Protection Area (EPA)
38.31 km² overlap
Horton Plains
IUCN IINational Park
13.75 km² overlap
Galaboda
IUCN IbReserved Forest
3.23 km² overlap
Rilagala
IUCN IaConservation Forest
2.23 km² overlap
21 more protected areassorted by overlap area
Hakgala
IUCN Not ReportedForest Reserve
1.83 km² overlap
Hakgala
IUCN IaStrict Nature Reserve
1.73 km² overlap
Mahakudugala
IUCN IaConservation Forest
1.63 km² overlap
Horagolla 2
IUCN IbReserved Forest
1.51 km² overlap
Bambarabedda weliketiya
IUCN IbReserved Forest
1.10 km² overlap
Udawattekelle
IUCN IbReserved Forest
1.06 km² overlap
Kalawala dumbadeyaya
IUCN IbReserved Forest
1.03 km² overlap
Gregory Lake EPA
IUCN VEnvironmental Protection Area (EPA)
0.87 km² overlap
Hapukanda Mihirikiriya
IUCN IaConservation Forest
0.84 km² overlap
Maoye Ella
IUCN Not ReportedForest Reserve
0.82 km² overlap
Raxawa
IUCN IbReserved Forest
0.69 km² overlap
Kiriammadeniya
IUCN IbReserved Forest
0.67 km² overlap
Galkandakele
IUCN IbReserved Forest
0.65 km² overlap
Dambakele
IUCN Not ReportedForest Reserve
0.60 km² overlap
Warathenna-Hakkinda EPA
IUCN VIEnvironmental Protection Area (EPA)
0.59 km² overlap
Dekinda
IUCN IbReserved Forest
0.34 km² overlap
Galway's Land
IUCN IVSanctuary
0.32 km² overlap
Kirimatiya Mukalana
IUCN IbReserved Forest
0.31 km² overlap
Kosgahalanda
IUCN IbReserved Forest
0.29 km² overlap
Koskandapatana
IUCN IbReserved Forest
0.21 km² overlap
Elapahura
IUCN IbReserved Forest
0.20 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 750 distinct species · 120 582 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 21 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 Mahaweli Ganga : 18 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 20 interactions GloBI sur 3 types (connectance 9.5%, filtre Serrano α=0.2). 3 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°
21,7°C
Annual rain
2 556mm
Moisture idx (CMI)
0,42
Runoff
996mm/an
PET
1 447mm
AET
1 410mm
Mean slope
12,5°
Water table
437cm
Forest
42%
Crops
53%
Urban
48%
Protected
11%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)