HydroBASINS lev08 watershed · #2080350220
Bassin de Szkwa
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 6 administrative regions : Ostrołęka, Ostrołęka (City), Ostrów Mazowiecka, Szczytno, Zambrów +1
Sub-basin area
1 641,8km²
Upstream area
21 656,6km²
Discharge
113,22m³/s
Mean elev.
121m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Narew1337 km²
- Bassin de Skroda17 km²
6 dept-equivalent regions (GADM L2)
- 716.9 km²43.5% of basin
- 458.2 km²27.8% of basin
- Szczytno395.7 km²24.0% of basin
- 41.7 km²2.5% of basin
- 31.2 km²1.9% of basin
- Ostrów Mazowiecka5.0 km²0.3% of basin
18 intersecting protected areas
Puszcza Piska
IUCN Not ReportedSpecial Protection Area (Birds Directive)
186.14 km² overlap
Równiny Kurpiowskiej i Doliny Dolnej Narwi
IUCN Not AssignedProtected Landscape Area
175.62 km² overlap
Dolina Dolnej Narwi
IUCN Not ReportedSpecial Protection Area (Birds Directive)
65.87 km² overlap
Spychowski
IUCN Not AssignedProtected Landscape Area
38.48 km² overlap
Ostoja Narwiańska
IUCN Not ReportedSite of Community Importance (Habitats Directive)
36.31 km² overlap
Czerwony Bór
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
18.36 km² overlap
Ostoja Piska
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.40 km² overlap
Myszynieckie Bory Sasankowe
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.59 km² overlap
Mokradła Kolneńskie i Kurpiowskie
IUCN Not ReportedSite of Community Importance (Habitats Directive)
3.01 km² overlap
9 more protected areassorted by overlap area
Olsy Płoszyckie
IUCN IVNature Reserve
1.41 km² overlap
Kaniston
IUCN IVNature Reserve
1.34 km² overlap
Łokieć
IUCN IVNature Reserve
1.19 km² overlap
Czarny Kąt
IUCN IVNature Reserve
0.33 km² overlap
Doliny Omulwi i Płodownicy
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.23 km² overlap
Pupy
IUCN IVNature Reserve
0.16 km² overlap
Mingos
IUCN IVNature Reserve
0.13 km² overlap
Dolina Pisy
IUCN Not ReportedSite of Community Importance (Habitats Directive)
0.04 km² overlap
Tabory
IUCN IVNature Reserve
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 428 distinct species · 17 376 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Szkwa : 27 espèces reliées par 82 interactions GloBI sur 6 types (connectance 15.5%, filtre Serrano α=0.2). 6 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
584mm
Moisture idx (CMI)
-0,18
Runoff
169mm/an
PET
711mm
AET
490mm
Mean slope
0,7°
Water table
72cm
Forest
27%
Crops
33%
Urban
3%
Protected
11%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)