HydroBASINS lev08 watershed · #2080350210
Bassin de Omulew
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 : Nidzica, Olsztyn, Ostrołęka, Ostrołęka (City), Przasnysz +1
Sub-basin area
2 102,5km²
Upstream area
2 102,5km²
Discharge
14,53m³/s
Mean elev.
135m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
6 dept-equivalent regions (GADM L2)
- Szczytno1099.7 km²52.1% of basin
- 624.8 km²29.6% of basin
- Przasnysz175.5 km²8.3% of basin
- Nidzica150.2 km²7.1% of basin
- 60.6 km²2.9% of basin
- 0.4 km²0.0% of basin
27 intersecting protected areas
Puszcza Napiwodzko-Ramucka
IUCN Not ReportedSpecial Protection Area (Birds Directive)
601.42 km² overlap
Puszczy Napiwodzko-Ramuckiej
IUCN Not AssignedProtected Landscape Area
576.92 km² overlap
Doliny Omulwi i Płodownicy
IUCN Not ReportedSpecial Protection Area (Birds Directive)
338.24 km² overlap
Ostoja Napiwodzko-Ramucka
IUCN Not ReportedSite of Community Importance (Habitats Directive)
126.88 km² overlap
Obszar Chronionego Krajobrazu Pojezierza Olsztyńskiego
IUCN Not AssignedProtected Landscape Area
82.59 km² overlap
Spychowski
IUCN Not AssignedProtected Landscape Area
39.68 km² overlap
Bory Chrobotkowe Karaska
IUCN Not ReportedSite of Community Importance (Habitats Directive)
11.25 km² overlap
Zachodniokurpiowskie Bory Sasankowe
IUCN Not ReportedSite of Community Importance (Habitats Directive)
10.06 km² overlap
Puszcza Piska
IUCN Not ReportedSpecial Protection Area (Birds Directive)
8.30 km² overlap
18 more protected areassorted by overlap area
Bory bagienne i torfowiska Karaska
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.59 km² overlap
Dolin Rzeki Nidy i Szkotówki
IUCN Not AssignedProtected Landscape Area
4.78 km² overlap
Torfowisko Karaska
IUCN IVNature Reserve
4.00 km² overlap
Małga
IUCN IVNature Reserve
1.64 km² overlap
Czarnia
IUCN IVNature Reserve
1.41 km² overlap
Galwica
IUCN IVNature Reserve
0.95 km² overlap
Ostoja Piska
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.80 km² overlap
Bagno Krzywek
IUCN Not AssignedNature Reserve
0.75 km² overlap
Koniuszanka II
IUCN IVNature Reserve
0.64 km² overlap
Uroczysko Korea
IUCN Not AssignedNature Reserve
0.51 km² overlap
Dolina Dolnej Narwi
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.40 km² overlap
Sołtysek
IUCN IVNature Reserve
0.39 km² overlap
Podgórze
IUCN IVNature Reserve
0.38 km² overlap
Dęby Napiwodzkie
IUCN IVNature Reserve
0.37 km² overlap
Koniuszanka I
IUCN IVNature Reserve
0.24 km² overlap
Kulka
IUCN IVNature Reserve
0.13 km² overlap
Nature Reserve
0.05 km² overlap
Surowe
IUCN IVNature Reserve
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 352 distinct species · 7 617 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 46 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 Omulew : 37 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 113 interactions GloBI sur 5 types (connectance 10.0%, filtre Serrano α=0.2). 11 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°
7,1°C
Annual rain
606mm
Moisture idx (CMI)
-0,14
Runoff
215mm/an
PET
703mm
AET
501mm
Mean slope
1,0°
Water table
86cm
Forest
49%
Crops
24%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)