HydroBASINS lev08 watershed · #2080535710
Bassin de Olt
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 40 administrative regions : Agas, Aita Mare, Araci, Baile Tusnad, Balan +35
Sub-basin area
1 819,3km²
Upstream area
1 819,3km²
Discharge
7,88m³/s
Mean elev.
875m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
40 dept-equivalent regions (GADM L2)
- 145.3 km²8.0% of basin
- 139.5 km²7.6% of basin
- 137.3 km²7.5% of basin
- 127.1 km²7.0% of basin
- 124.8 km²6.8% of basin
- 124.5 km²6.8% of basin
- 116.8 km²6.4% of basin
- 101.5 km²5.6% of basin
32 moreFull L2 list
- Miercurea Ciuc98.3 km² · 5.4%
- Valea Crisului81.3 km² · 4.5%
- Mihaileni76.6 km² · 4.2%
- Tusnad76.0 km² · 4.2%
- Sfantu Gheorghe72.4 km² · 4.0%
- Frumoasa68.9 km² · 3.8%
- Bodoc65.9 km² · 3.6%
- Sansimion64.7 km² · 3.5%
- Pauleni-ciuc49.3 km² · 2.7%
- Ghidfalau45.8 km² · 2.5%
- Ilieni37.7 km² · 2.1%
- Gheorgheni15.2 km² · 0.8%
- Batanii Mari13.2 km² · 0.7%
- Suseni12.1 km² · 0.7%
- Chichis5.1 km² · 0.3%
- Ozun4.7 km² · 0.3%
- Damuc3.7 km² · 0.2%
- Balan3.5 km² · 0.2%
- Araci3.5 km² · 0.2%
- Voslabeni2.2 km² · 0.1%
- Baile Tusnad1.9 km² · 0.1%
- Lunca De Sus1.6 km² · 0.1%
- Lunca De Jos1.1 km² · 0.1%
- Belin1.0 km² · 0.1%
- Agas0.6 km² · 0.0%
- Turia0.4 km² · 0.0%
- Vlahita0.4 km² · 0.0%
- Aita Mare0.0 km² · 0.0%
- Plaiesii De Jos0.0 km² · 0.0%
- Zetea0.0 km² · 0.0%
- Bradut0.0 km² · 0.0%
- Cernat0.0 km² · 0.0%
28 intersecting protected areas
Depresiunea și Munții Ciucului
IUCN Not ReportedSpecial Protection Area (Birds Directive)
467.42 km² overlap
Munții Ciucului
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
287.36 km² overlap
Munții Bodoc - Baraolt
IUCN Not ReportedSpecial Protection Area (Birds Directive)
234.99 km² overlap
Harghita Mădăraș
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
47.07 km² overlap
Bazinul Ciucului de Jos
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
27.60 km² overlap
Depresiunea și Munții Giurgeului
IUCN Not ReportedSpecial Protection Area (Birds Directive)
25.33 km² overlap
Ciomad - Balvanyos
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
18.13 km² overlap
Cheile Bicazului - Hășmaș
IUCN Not ReportedSpecial Protection Area (Birds Directive)
15.61 km² overlap
Cheile Bicazului - Hășmaș
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
14.97 km² overlap
19 more protected areassorted by overlap area
National park
14.82 km² overlap
Masivul Hășmașul Mare, Piatra Singuratică - Hășmașul Negru
IUCN Not AssignedNot Assigned
8.51 km² overlap
Tinovul Mohoș - Lacul Sf. Ana
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.35 km² overlap
Oltul Superior
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.42 km² overlap
Tinovul Mohoș
IUCN IVNature reserve
2.30 km² overlap
Lacul Sfânta Ana
IUCN IVNature reserve
2.01 km² overlap
Tinovul Luci
IUCN Not AssignedNot Assigned
0.32 km² overlap
Tinovul Luci
IUCN Not ReportedSite of Community Importance (Habitats Directive)
0.32 km² overlap
Mlaștina Nyirkert
IUCN IVNature reserve
0.17 km² overlap
Herculian
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.15 km² overlap
Piatra Șoimilor
IUCN Not AssignedNot Assigned
0.14 km² overlap
Mlaștina Valea de Mijloc
IUCN IVNature reserve
0.12 km² overlap
Mlaștina Beneș
IUCN IVNature reserve
0.11 km² overlap
Mlaștina Csemo - Vrabia
IUCN IVNature reserve
0.08 km² overlap
Nature reserve
0.06 km² overlap
Mlaștina Nadas
IUCN IVNature reserve
0.05 km² overlap
Rezervația geologică de la Sâncrăieni
IUCN Not AssignedNot Assigned
0.05 km² overlap
Mlaștina Budos - Sântimbru
IUCN Not AssignedNot Assigned
0.02 km² overlap
Cheile Bicazului și Lacul Roșu
IUCN Not AssignedNot Assigned
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 928 distinct species · 21 013 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Olt : 29 espèces reliées par 83 interactions GloBI sur 4 types (connectance 12.5%, filtre Serrano α=0.2). 8 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°
6,0°C
Annual rain
667mm
Moisture idx (CMI)
-0,12
Runoff
184mm/an
PET
766mm
AET
561mm
Mean slope
8,6°
Water table
411cm
Forest
47%
Crops
23%
Urban
4%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)