HydroBASINS lev08 watershed · #2080664680
Bassin de Rio Maior
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 : Alcanena, Alcobaça, Alenquer, Azambuja, Cadaval +5
Sub-basin area
900,5km²
Upstream area
900,5km²
Discharge
10,37m³/s
Mean elev.
115m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
10 dept-equivalent regions (GADM L2)
- 270.4 km²30.0% of basin
- Rio MaiorSantarém · Portugal270.2 km²30.0% of basin
- AzambujaLisboa · Portugal159.8 km²17.7% of basin
- CartaxoSantarém · Portugal124.2 km²13.8% of basin
- Porto de MósLeiria · Portugal45.9 km²5.1% of basin
- CadavalLisboa · Portugal21.7 km²2.4% of basin
- AlcobaçaLeiria · Portugal6.2 km²0.7% of basin
- Caldas da RainhaLeiria · Portugal2.6 km²0.3% of basin
2 moreFull L2 list
- Alcanena0.1 km² · 0.0%
- Alenquer0.0 km² · 0.0%
4 intersecting protected areas
Serras d'Aire e Candeeiros
IUCN Not ReportedSite of Community Importance (Habitats Directive)
109.99 km² overlap
Nature Park
106.90 km² overlap
Serra de Montejunto
IUCN Not ReportedSite of Community Importance (Habitats Directive)
8.96 km² overlap
Serra de Montejunto
IUCN VProtected Landscape
8.72 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 758 distinct species · 114 389 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 41 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 Rio Maior : 34 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 100 interactions GloBI sur 5 types (connectance 12.2%, filtre Serrano α=0.2). 7 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°
15,9°C
Annual rain
736mm
Moisture idx (CMI)
-0,23
Runoff
363mm/an
PET
962mm
AET
581mm
Mean slope
3,7°
Water table
201cm
Forest
46%
Crops
27%
Urban
3%
Protected
13%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)