HydroBASINS lev08 watershed · #2080357350
Bassin de Orzyc
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 9 administrative regions : Ciechanów, Działdowo, Maków, Mława, Nidzica +4
Sub-basin area
2 080,5km²
Upstream area
2 080,5km²
Discharge
12,89m³/s
Mean elev.
134m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
9 dept-equivalent regions (GADM L2)
- Przasnysz991.8 km²47.5% of basin
- 461.6 km²22.1% of basin
- Nidzica353.3 km²16.9% of basin
- Mława245.2 km²11.7% of basin
- Szczytno23.0 km²1.1% of basin
- 6.4 km²0.3% of basin
- Ciechanów5.7 km²0.3% of basin
- Działdowo2.1 km²0.1% of basin
1 moreFull L2 list
- Pułtusk0.0 km² · 0.0%
12 intersecting protected areas
Puszczy Napiwodzko-Ramuckiej
IUCN Not AssignedProtected Landscape Area
164.29 km² overlap
Zieluńsko-Rzęgnowski
IUCN Not AssignedProtected Landscape Area
100.68 km² overlap
Puszcza Napiwodzko-Ramucka
IUCN Not ReportedSpecial Protection Area (Birds Directive)
98.04 km² overlap
Doliny Rzeki Orzyc
IUCN Not AssignedProtected Landscape Area
47.42 km² overlap
Krośnicko-Kosmowski
IUCN Not AssignedProtected Landscape Area
43.14 km² overlap
Ostoja Napiwodzko-Ramucka
IUCN Not ReportedSite of Community Importance (Habitats Directive)
21.25 km² overlap
Zachodniokurpiowskie Bory Sasankowe
IUCN Not ReportedSite of Community Importance (Habitats Directive)
12.10 km² overlap
Doliny Omulwi i Płodownicy
IUCN Not ReportedSpecial Protection Area (Birds Directive)
5.69 km² overlap
Dolina Dolnej Narwi
IUCN Not ReportedSpecial Protection Area (Birds Directive)
1.81 km² overlap
3 more protected areassorted by overlap area
Zwierzyniec
IUCN IVNature Reserve
0.40 km² overlap
Świńskie Bagno
IUCN IVNature Reserve
0.02 km² overlap
Landscape Park
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 157 distinct species · 5 510 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Orzyc : 27 espèces reliées par 121 interactions GloBI sur 6 types (connectance 17.2%, 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
574mm
Moisture idx (CMI)
-0,19
Runoff
194mm/an
PET
708mm
AET
484mm
Mean slope
0,9°
Water table
107cm
Forest
24%
Crops
45%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)