Rivière· 2 segments
Härjaoja
Crosses 3 administrative regions : Iisaku, Mäetaguse, Tudulinna
Total length
23km
Max discharge
3,8m³/s
Max Strahler
4
Segments matched
2
River geography3 admin regions · 0 communes
3 administrative regions crossed (GADM L2)
- TudulinnaIda-Viru · Estonia8.8 kmin this dpt
- MäetaguseIda-Viru · Estonia4.9 kmin this dpt
- IisakuIda-Viru · Estonia3.9 kmin this dpt
24 intersecting protected areas
Alutaguse rahvuspark
IUCN Not AssignedNational park
Muraka
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Muraka
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Muraka
IUCN IbWetland of International Importance (Ramsar Site)
Wilderness conservation zone of national park
Alutaguse RP, Matkasoo skv.
IUCN IVManaged conservation zone of national park
Alutaguse RP, Rüütli skv.
IUCN IbWilderness conservation zone of national park
Alutaguse RP, Roostoja skv.
IUCN IVManaged conservation zone of national park
VEP nr.L02135
IUCN Not AssignedWoodland key habitat
15 more protected areassorted by area
VEP nr.207296
IUCN Not AssignedWoodland key habitat
VEP nr.213081
IUCN Not AssignedWoodland key habitat
VEP nr.103064
IUCN Not AssignedWoodland key habitat
VEP nr.213080
IUCN Not AssignedWoodland key habitat
VEP nr.207309
IUCN Not AssignedWoodland key habitat
VEP nr.E00527
IUCN Not AssignedWoodland key habitat
VEP nr.211294
IUCN Not AssignedWoodland key habitat
VEP nr.103067
IUCN Not AssignedWoodland key habitat
VEP nr.207293
IUCN Not AssignedWoodland key habitat
VEP nr.103059
IUCN Not AssignedWoodland key habitat
VEP nr.207294
IUCN Not AssignedWoodland key habitat
VEP nr.103086
IUCN Not AssignedWoodland key habitat
VEP nr.E00529
IUCN Not AssignedWoodland key habitat
VEP nr.207295
IUCN Not AssignedWoodland key habitat
VEP nr.E00528
IUCN Not AssignedWoodland key habitat
1 page = 1 named river (aggregation of 2 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
554 distinct species · 1 812 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 Härjaoja : 27 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 43 interactions GloBI sur 6 types (connectance 6.8%, filtre Serrano α=0.2). 9 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydrology (HydroRIVERS v10)
Total length
23km
Max discharge
3,8m³/s
Max Strahler
4
Segments matched
2
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.