Ruisseau· 16 segments
Olona
Crosses 4 administrative regions : Como, Milano, Pavia, Varese
Total length
104km
Max discharge
6,3m³/s
Max Strahler
3
Segments matched
16
River geography4 admin regions · 0 communes
4 administrative regions crossed (GADM L2)
- VareseLombardia · Italy48.8 kmin this dpt
- MilanoLombardia · Italy7.6 kmin this dpt
- PaviaLombardia · Italy4.0 kmin this dpt
- ComoLombardia · Italy0.0 kmin this dpt
11 intersecting protected areas
Regional/Provincial Nature Park
Lago di Varese
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Regional/Provincial Nature Park
Versante Nord del Campo dei Fiori
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Parco Regionale Campo dei Fiori
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Grotte del Campo dei Fiori
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Monte Legnone e Chiusarella
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Alnete del Lago di Varese
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Regional/Provincial Nature Reserve
2 more protected areassorted by area
Garzaia di Porta Chiossa
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Garzaia di Porta Chiossa
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1 page = 1 named river (aggregation of 16 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
755 distinct species · 6 175 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 43 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 Olona : 30 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 115 interactions GloBI sur 6 types (connectance 11.6%, filtre Serrano α=0.2). 15 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
104km
Max discharge
6,3m³/s
Max Strahler
3
Segments matched
16
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.