HydroBASINS lev08 watershed · #2080258140
Bassin de Ärma jõgi
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 : Karksi, Kolga-Jaani, Kõo, Paistu, Pärsti +6
Sub-basin area
756,4km²
Upstream area
756,5km²
Discharge
6,55m³/s
Mean elev.
64m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
11 dept-equivalent regions (GADM L2)
- ViiratsiViljandi · Estonia197.7 km²26.0% of basin
- Kolga-JaaniViljandi · Estonia182.0 km²23.9% of basin
- SaarepeediViljandi · Estonia96.0 km²12.6% of basin
- PaistuViljandi · Estonia82.3 km²10.8% of basin
- TarvastuViljandi · Estonia72.3 km²9.5% of basin
- VõrtsjärveTartu · Estonia46.9 km²6.2% of basin
- Suure-JaaniViljandi · Estonia36.0 km²4.7% of basin
- PärstiViljandi · Estonia27.3 km²3.6% of basin
3 moreFull L2 list
- Viljandi13.2 km² · 1.7%
- Kõo5.1 km² · 0.7%
- Karksi1.6 km² · 0.2%
30 intersecting protected areas
Võrtsjärve
IUCN Not ReportedSpecial Protection Area (Birds Directive)
49.98 km² overlap
Võrtsjärve
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
48.52 km² overlap
Limited-conservation area
47.36 km² overlap
Parika
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
20.48 km² overlap
Parika
IUCN Not ReportedSpecial Protection Area (Birds Directive)
20.48 km² overlap
Parika looduskaitseala
IUCN Not AssignedNature reserve
20.48 km² overlap
Loodi looduspark
IUCN Not AssignedProtected landscape (nature park)
19.81 km² overlap
Parika LKA, Parika skv.
IUCN IVManaged conservation zone of nature reserve
17.22 km² overlap
Loodi LP, Loodi pv.
IUCN VLimited management zone of protected landscape
15.35 km² overlap
21 more protected areassorted by overlap area
Viljandi maastikukaitseala
IUCN Not AssignedProtected landscape (nature park)
3.65 km² overlap
Limited management zone of protected landscape
3.47 km² overlap
Parika LKA, Särgla skv.
IUCN IVManaged conservation zone of nature reserve
3.01 km² overlap
Alam-Pedja
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.16 km² overlap
Alam-Pedja
IUCN Not ReportedSpecial Protection Area (Birds Directive)
2.16 km² overlap
Alam-Pedja
IUCN IaWetland of International Importance (Ramsar Site)
2.16 km² overlap
Managed conservation zone of nature reserve
2.16 km² overlap
Alam-Pedja looduskaitseala
IUCN Not AssignedNature reserve
2.16 km² overlap
Võrtsjärve hoiuala (Tartu)
IUCN VILimited-conservation area
1.68 km² overlap
Viljandi
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.56 km² overlap
Managed conservation zone of protected landscape
1.56 km² overlap
Managed conservation zone of protected landscape
1.51 km² overlap
Loodi LP, Nõmme skv.
IUCN VManaged conservation zone of protected landscape
1.33 km² overlap
Tänassilma
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.14 km² overlap
Otiküla
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.63 km² overlap
Uue-Võidu maastikukaitseala
IUCN Not AssignedProtected landscape (nature park)
0.50 km² overlap
Limited management zone of protected landscape
0.50 km² overlap
Kiviaru
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.33 km² overlap
Varesemägede maastikukaitseala
IUCN Not AssignedProtected landscape (nature park)
0.25 km² overlap
Limited management zone of protected landscape
0.25 km² overlap
Parika LKA, Nõuassaare skv.
IUCN IVManaged conservation zone of nature reserve
0.25 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 356 distinct species · 76 087 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 42 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 Ärma jõgi : 34 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 57 interactions GloBI sur 6 types (connectance 6.6%, filtre Serrano α=0.2). 8 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°
5,1°C
Annual rain
617mm
Moisture idx (CMI)
0,09
Runoff
302mm/an
PET
560mm
AET
422mm
Mean slope
1,0°
Water table
75cm
Forest
21%
Crops
20%
Urban
1%
Protected
13%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)