HydroBASINS lev08 watershed · #2080352720
Bassin de Wkra
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 10 administrative regions : Brodnica, Działdowo, Iława, Mława, Nidzica +5
Sub-basin area
1 777,5km²
Upstream area
1 777,5km²
Discharge
11,13m³/s
Mean elev.
162m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
10 dept-equivalent regions (GADM L2)
- Działdowo767.4 km²43.0% of basin
- Żuromin424.9 km²23.8% of basin
- Nidzica369.0 km²20.7% of basin
- Ostróda178.7 km²10.0% of basin
- Iława15.8 km²0.9% of basin
- Mława12.4 km²0.7% of basin
- Sierpc10.5 km²0.6% of basin
- 5.3 km²0.3% of basin
30 intersecting protected areas
Doliny Wkry i Mławki
IUCN Not ReportedSpecial Protection Area (Birds Directive)
159.29 km² overlap
Welski Park Krajobrazowy
IUCN VLandscape Park
147.91 km² overlap
Międzyrzecze Skrwy i Wkry
IUCN Not AssignedProtected Landscape Area
125.68 km² overlap
Dolin Rzeki Nidy i Szkotówki
IUCN Not AssignedProtected Landscape Area
80.17 km² overlap
Nadwkrzański
IUCN Not AssignedProtected Landscape Area
63.09 km² overlap
Dąbrówieński
IUCN Not AssignedProtected Landscape Area
62.30 km² overlap
Landscape Park
60.82 km² overlap
Doliny Górnej Wkry
IUCN Not AssignedProtected Landscape Area
41.60 km² overlap
Wzgórz Dylewskich
IUCN Not AssignedProtected Landscape Area
38.74 km² overlap
21 more protected areassorted by overlap area
Zieluńsko-Rzęgnowski
IUCN Not AssignedProtected Landscape Area
37.43 km² overlap
Ostoja Welska
IUCN Not ReportedSite of Community Importance (Habitats Directive)
33.89 km² overlap
Landscape Park
20.91 km² overlap
Grzybiny
IUCN Not AssignedProtected Landscape Area
20.90 km² overlap
Jeziora Mielno
IUCN Not AssignedProtected Landscape Area
19.03 km² overlap
Otuliny Welskiego Parku Krajobrazowego - Dębień
IUCN Not AssignedProtected Landscape Area
17.77 km² overlap
Ostoja Lidzbarska
IUCN Not ReportedSite of Community Importance (Habitats Directive)
17.41 km² overlap
Równina Raciążska
IUCN Not AssignedProtected Landscape Area
10.53 km² overlap
Otuliny Welskiego Parku Krajobrazowego - Słup
IUCN Not AssignedProtected Landscape Area
9.82 km² overlap
Ostoja Dylewskie Wzgórza
IUCN Not ReportedSite of Community Importance (Habitats Directive)
7.29 km² overlap
Okolice Rybna i Lidzbarka
IUCN Not AssignedProtected Landscape Area
6.40 km² overlap
Puszczy Napiwodzko-Ramuckiej
IUCN Not AssignedProtected Landscape Area
5.41 km² overlap
Hartowiecki
IUCN Not AssignedProtected Landscape Area
2.33 km² overlap
Naguszewski
IUCN Not AssignedProtected Landscape Area
2.16 km² overlap
Gołuska Kępa
IUCN IVNature Reserve
1.91 km² overlap
Buchnowski
IUCN Not AssignedProtected Landscape Area
1.82 km² overlap
Ostrów Tarczyński
IUCN IVNature Reserve
1.07 km² overlap
Przełomowa Dolina Rzeki Wel
IUCN Not ReportedSite of Community Importance (Habitats Directive)
0.71 km² overlap
Bagno Koziana
IUCN IVNature Reserve
0.55 km² overlap
Klonowo
IUCN IVNature Reserve
0.33 km² overlap
Jezioro Neliwa
IUCN IVNature Reserve
0.17 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 482 distinct species · 10 073 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 Wkra : 27 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 110 interactions GloBI sur 5 types (connectance 14.1%, filtre Serrano α=0.2). 13 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°
7,0°C
Annual rain
606mm
Moisture idx (CMI)
-0,13
Runoff
207mm/an
PET
696mm
AET
504mm
Mean slope
1,0°
Water table
104cm
Forest
15%
Crops
59%
Urban
2%
Protected
13%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)