Höwenegg (nature reserve)

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Höwenegg” nature reserve

IUCN Category IV – Habitat/Species Management Area

Blick in den durch Basaltabbau entstandenen, 85 Meter tiefen Krater am Höwenegg

View into the 85-metre-deep crater at Höwenegg, which was created by basalt quarrying

Location Immendingen, district of Tuttlingen, Baden-Württemberg, Germany
Area 20,732 ha
Identifier 3.128
WDPA ID 81944
Geographical position 47° 55′ N, 8° 44′ ECoordinates 47° 54′ 49″ N, 8° 44′ 24″ O
Höwenegg (Naturschutzgebiet) (Baden-Württemberg)
Höwenegg (Naturschutzgebiet)

Sea level from 774 m to 798 m
Setup date 24.June 1983
Administration Freiburg regional council

The Höwenegg area is a nature reserve (NSG number 3.128) in the municipality of Immendingen in the Tuttlingen district of Baden-Württemberg in Germany, designated by decree of 24 June 1983 by the Freiburg Regional Council.


The nature reserve “Höwenegg”, which covers about 21 hectares, belongs to the natural area “Hegaualb”. It is located about 2.7 kilometres south of the centre of Immendingen at an altitude of about 774to 798 mabove sea level[1] and stretches around the Höwenegg, which gives the area its name, the northernmost of the Hegau volcanoes[2]with the striking crater lake and the ruins of Immendingen Castle.

Protective purpose

The essential purpose of protection is “the preservation of the Höwenegg volcanic complex as a geological document with unique insights into volcanic genesis and as a habitat for rare animals and plants”.[3]

Contiguous protected areas

Together with the nature reserve “Höwenegg”, the bird sanctuary “Höwenegg” (SG-Nr. DE-8018-401) is designated as a contiguous protected area.

Flora and fauna

The protected area, including the former quarry and the adjacent forests, represents a richly structured biotope, habitat for partly rare plant and animal species.


Of particular interest from a vegetation point of view at Höwenegg are the sites on the quarry walls and floors and on the basalt block rubble heaps.

German Fransenenzian

The following plant species (selection) are documented in the protected area:

  • Field flaxweed(Linaria arvensis)[4]
  • Field campion(Silene noctiflora)[5]also called “night-flowering campion” or “night carnation”
  • German Fringed Gentian(Gentianella germanica)
  • Grass pea(Lathyrus nissolia)
  • Gnat’s hellebore(Gymnadenia conopsea)
  • Oriental grouper(Bunias orientalis)
  • Purple orchid(Orchis purpurea)
  • Turk’s-bundle(Lilium martagon)
  • White wood pea(Cephalanthera damasonium)
  • Two-leaved wood hyacinth(Platanthera bifolia)


Grass Frog Venussymbol (weiblich)

Mountain Sand Beetle

Aurora butterfly

Eagle owl

The following animal species (selection) are documented in the protected area:

  • Amphibians, mainly occurring in the narrower crater area
    • Alpine newt(Ichthyosaura alpestris)
    • Common toad(Bufo bufo)
    • Grass frog(Rana temporaria)
    • Natterjack toad(Epidalea calamita)
  • Insects prefer the rapidly heating quarry walls, block rubble heaps and ruderal areas
    • Beetle
      • Mountain Sand Beetle(Cicindela sylvicola)
    • Newfie
      • Long-legged butterfly(Libelloides longicornis)
      • Dragonfly Butterfly Shad(Libelloides coccajus)
    • Butterflies
      • Admiral(Vanessa atalanta)
      • Aurora butterfly(Anthocharis cardamines)
      • Brown forest bird(Aphantopus hyperantus)
      • Yellow-throated Fritillary(Carterocephalus palaemon)
      • Green Fritillary(Callophrys rubi)
      • Small fox(Aglais urticae)
      • Meadowsweet Pearl Butterfly or “Purple Silver Butterfly”(Brenthis ino)
      • Plum-crowned fritillary butterfly(Satyrium pruni)
      • Rust-coloured bullhead butterfly(Ochlodes sylvanus)
      • Red-brown meadowbird(Coenonympha glycerion)
      • Red fritillary(Melitaea didyma)
      • Red rim bear(Diacrisia sannio)
      • Mustard white butterfly, also known as “ink spot white butterfly” or “legume white butterfly”(Leptidea sinapis)
      • Slippery elm butterfly(Satyrium w-album)
      • White-banded meadowbird(Coenonympha arcania)
      • Western fritillary(Melitaea parthenoides)
      • Dwarf Blue(Cupido minimus)
  • Birds
    • Common raven(Corvus corax), regularly breeding, occurrence of special importance in Baden-Württemberg
    • Black woodpecker(Dryocopus martius)
    • Eagle owl(Bubo bubo)
    • Peregrine Falcon(Falco peregrinus)

See also

  • List of nature reserves in the district of Tuttlingen
  • List of nature reserves in Baden-Württemberg

Web links

Individual references

  1. Top25 Viewer – [Top. map 1:25000 Baden-Württemberg (south)]
  2. Citizens’ Service Immendingen, information board of the municipality of Immendingen ‘on the spot’
  3. Protective purpose in the profile of the nature reserve in the LUBW list of protected areas
  4. Linaria arvensis (L.) Desf., field flaxweed.
  5. Silene noctiflora L., field slime.