Ruisseau· 15 segments
La Ternoise
Crosses 1 administrative regions : Pas-de-Calais
Total length
42km
Max discharge
6,3m³/s
Max Strahler
3
Segments matched
15
River geography1 admin regions · 31 communes
1 administrative regions crossed (GADM L2)
- Pas-de-CalaisHauts-de-France · France39.7 kmin this dpt
31 communes (L5)For countries with L5
- Hernicourt4.36 km
- Saint-Michel-sur-Ternoise4.16 km
- Blangy-sur-Ternoise3.68 km
- Gauchin-Verloingt2.88 km
- Ramecourt2.73 km
- Monchy-Cayeux2.54 km
- Rollancourt2.49 km
- Le Parcq2.32 km
- Saint-Pol-sur-Ternoise2.23 km
- Tilly-Capelle1.98 km
- Auchy-lès-Hesdin1.78 km
- Grigny1.51 km
- Érin1.47 km
- Wavrans-sur-Ternoise1.45 km
- Blingel1.26 km
- Teneur0.96 km
- Huby-Saint-Leu0.54 km
- Anvin0.50 km
- Marconne0.47 km
- Roëllecourt0.23 km
- Hesdin0.14 km
- Wamin0.00 km
- Pierremont0.00 km
- Herlincourt0.00 km
- Eps0.00 km
- Fleury0.00 km
- Hestrus0.00 km
- Herlin-le-Sec0.00 km
- Troisvaux0.00 km
- Marconnelle0.00 km
- Ostreville0.00 km
2 intersecting protected areas
Marais De La Grenouillère
IUCN IVRegional Nature Reserve
Marais de la grenouillère
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1 page = 1 named river (aggregation of 15 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
603 distinct species · 8 190 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 26 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 La Ternoise : 22 espèces reliées par 52 interactions GloBI sur 5 types (connectance 16.0%, 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).
Hydrology (HydroRIVERS v10)
Total length
42km
Max discharge
6,3m³/s
Max Strahler
3
Segments matched
15
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.