HydroBASINS lev08 watershed · #4080048950
Bassin de Gin 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 22 administrative regions : Akmeemana, Akuressa, Ambalangoda, Baddegama, Bope-Poddala +17
Sub-basin area
927,6km²
Upstream area
927,8km²
Discharge
51,76m³/s
Mean elev.
190m
Administrative coverage
22 dept-equivalent regions (GADM L2)
- 153.6 km²16.6% of basin
- 141.8 km²15.4% of basin
- 140.4 km²15.2% of basin
- 109.7 km²11.9% of basin
- 102.7 km²11.1% of basin
- 59.3 km²6.4% of basin
- 34.2 km²3.7% of basin
- 33.2 km²3.6% of basin
14 moreFull L2 list
- Akmeemana32.8 km² · 3.5%
- Bope-Poddala26.6 km² · 2.9%
- Kolonna18.9 km² · 2.0%
- Niyagama14.8 km² · 1.6%
- Yakkalamulla14.6 km² · 1.6%
- Hikkaduwa11.5 km² · 1.2%
- Pitabeddara6.7 km² · 0.7%
- Palindanuwara6.4 km² · 0.7%
- Akuressa6.1 km² · 0.7%
- Galle Four Gravets4.4 km² · 0.5%
- Ambalangoda2.6 km² · 0.3%
- Walallawita2.3 km² · 0.2%
- Karandeniya0.6 km² · 0.1%
- Pasgoda0.3 km² · 0.0%
18 intersecting protected areas
National Heritage Wilderness Area
74.45 km² overlap
Sinharaja Forest Reserve
IUCN Not ApplicableWorld Heritage Site (natural or mixed)
63.85 km² overlap
Sinharaja Forest Reserve
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
63.85 km² overlap
Sinharaja
IUCN Not ReportedReserved Forest
57.70 km² overlap
Kanneliya-Dediyagala-Nakiyadeniya (KDN)
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
51.68 km² overlap
Kanneliya
IUCN IbReserved Forest
46.96 km² overlap
Malambure
IUCN IbReserved Forest
8.59 km² overlap
Nakiyadeniya
IUCN IaConservation Forest
5.81 km² overlap
Diyadawa
IUCN IaConservation Forest
5.67 km² overlap
9 more protected areassorted by overlap area
Darakulkanda
IUCN IbReserved Forest
2.35 km² overlap
Dediyagala
IUCN IbReserved Forest
1.39 km² overlap
Kalubovitiyana
IUCN IaConservation Forest
1.17 km² overlap
Polghakanda
IUCN IbReserved Forest
0.91 km² overlap
Nerugalkanda
IUCN IbReserved Forest
0.65 km² overlap
Dhanawalakanda
IUCN IbReserved Forest
0.64 km² overlap
Panilkanda
IUCN IbReserved Forest
0.19 km² overlap
Auwegalakanda
IUCN IbReserved Forest
0.15 km² overlap
Auwegalkanda
IUCN IaConservation Forest
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 464 distinct species · 29 337 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Gin Ganga : 27 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 30 interactions GloBI sur 3 types (connectance 6.5%, 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°
25,9°C
Annual rain
3 186mm
Moisture idx (CMI)
0,58
Runoff
1 424mm/an
PET
1 339mm
AET
1 335mm
Mean slope
8,0°
Water table
281cm
Forest
34%
Crops
49%
Urban
35%
Protected
15%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)