HydroBASINS lev08 watershed · #2080493230

Bassin de Alter Rhein

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 across 3 countries : Appenzell Ausserrhoden, Appenzell Innerrhoden, Bodensee, Bodenseekreis, Bregenz +4

451% lakePfafstetter: 23269057

Sub-basin area

164,6km²

Upstream area

7 934,7km²

Discharge

262,34m³/s

Mean elev.

478m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Mühlebach123 km²

▲ Receives from 2 basins

Bassin de Bregenzer Ach1069 km²
Bassin de Rhein551 km²

10 dept-equivalent regions (GADM L2)

Bodensee
Baden-Württemberg · Germany
53.4 km²
32.3% of basin
Appenzell Ausserrhoden
Appenzell Ausserrhoden · Switzerland
27.4 km²
16.6% of basin
Bregenz
Vorarlberg · Austria
22.5 km²
13.7% of basin
Lindau (Bodensee)
Bayern · Germany
17.9 km²
10.8% of basin
Bodenseekreis
Baden-Württemberg · Germany
16.3 km²
9.9% of basin
Bodensee
Thurgau · Switzerland
11.2 km²
6.8% of basin
Rorschach
Sankt Gallen · Switzerland
6.8 km²
4.1% of basin
Rheintal
Sankt Gallen · Switzerland
6.5 km²
4.0% of basin

2 moreFull L2 list

Sankt Gallen1.6 km² · 0.9%
Appenzell Innerrhoden1.5 km² · 0.9%

30 intersecting protected areas

Rheindelta
IUCN IV
Nature Reserve
9.22 km² overlap
Rheindelta
IUCN Not Reported
Special Protection Area (Birds Directive)
9.21 km² overlap
Rheindelta
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
9.21 km² overlap
Rheindelta
IUCN Ia
Wetland of International Importance (Ramsar Site)
9.15 km² overlap
Seenplatte und Hügelland südlich der Argen und Nonnenbachtal (2 Teilgebiete)
IUCN V
Landscape Protection Area
4.76 km² overlap
Bayerischer Bodensee
IUCN Not Reported
Special Protection Area (Birds Directive)
3.89 km² overlap
Bayerisches Bodenseeufer
IUCN V
Landscape Protection Area
3.77 km² overlap
Bayerisches Bodenseeufer
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
1.47 km² overlap
Argen und Feuchtgebiete bei Neukirch und Langnau
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
1.26 km² overlap

21 more protected areassorted by overlap area

Alter Rhein: Thal (SG)
IUCN IV
Federal Inventory of Reserves for Waterbirds and Migratory Birds of International and National Imp.
0.96 km² overlap
Bodenseeuferlandschaft östlich Friedrichshafen
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
0.90 km² overlap
Württembergisches Bodenseeufer
IUCN V
Landscape Protection Area
0.78 km² overlap
Eselschwanz
IUCN IV
Federal Inventory of Amphibian Spawning Areas of National Importance
0.59 km² overlap
Unterreitnauer Moos und NSG 'Mittelseemoos bei Wasserburg'
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
0.54 km² overlap
Bodenseeriet, Altenrhein
IUCN IV
Federal Inventory of Amphibian Spawning Areas of National Importance
0.28 km² overlap
Fuchsloch-Buriet
IUCN IV
Federal Inventory of Amphibian Spawning Areas of National Importance
0.25 km² overlap
Altenrhein
IUCN IV
Federal Inventory of Fenlands of National Importance
0.23 km² overlap
Altenrhein
IUCN IV
Federal Inventory of Alluvial Zones of National Importance
0.22 km² overlap
Bisen
IUCN IV
Federal Inventory of Amphibian Spawning Areas of National Importance
0.22 km² overlap
Buriet/Buechsee
IUCN IV
Federal Inventory of Fenlands of National Importance
0.19 km² overlap
Berger Weiher
IUCN IV
Nature Reserve
0.19 km² overlap
Hirrensee
IUCN IV
Nature Reserve
0.16 km² overlap
Bichlweiher und Bichlweihermoos
IUCN IV
Nature Reserve
0.12 km² overlap
Schachried
IUCN IV
Nature Reserve
0.11 km² overlap
Schönmoos
IUCN IV
Nature Reserve
0.09 km² overlap
Mittelseemoos
IUCN IV
Nature Reserve
0.07 km² overlap
Wasserburger Bucht
IUCN IV
Nature Reserve
0.06 km² overlap
Eiszeitliche Ränder des Argentals mit Argenaue
IUCN V
Landscape Protection Area
0.05 km² overlap
Buriet/Buechsee
IUCN Not Assigned
Private Nature Reserves
0.02 km² overlap
Grub AR/Dorfweiher
IUCN IV
Federal Inventory of Amphibian Spawning Areas of National Importance
0.01 km² overlap

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

6 409 distinct species · 241 859 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 56 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).

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Bassin de Alter Rhein : 22 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 247 interactions GloBI sur 6 types (connectance 13.1%, filtre Serrano α=0.2). 40 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées

Interactions affichées

247

Connectance

0.131

Patrimoniales

Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydroclimate (BasinATLAS lev08)

Mean T°

8,8°C

Annual rain

1 113mm

Moisture idx (CMI)

0,29

Runoff

990mm/an

PET

785mm

AET

742mm

Mean slope

3,1°

Water table

116cm

Forest

45%

Crops

15%

Urban

29%

Protected

13%

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)