The Hirschzungen sinkhole has steep and partially overhanging walls. Its age is estimated at around 500 years. The collapse of the underlying karst cave took place in historical times.
The deer tongue is a fern that needs shady and moist steep slopes on limestone or gypsum soil. These requirements are very well met in the approximately 10 m deep sinkhole,

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Martl

May 9, 2021

Hiking

The deer tongue is a fern with a simple leaf and is considered rare. She loves soaked rock walls and subsoil with little soil. The northernmost deposit known to me is in front of Smoo Cave in northern Scotland. There is also a small stock growing in a column in the Roman Forum. There are several deposits in the gypsum karst area of the southern Harz.

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Martl

November 12, 2021

Hiking

With the surrounding vertical walls, this is a prime example of a sinkhole. Here is also the most impressive stag-tongue fern occurrence in the region that I know of. Sporadic occurrences occur again and again along the karst hiking trail, but they are not as noticeable as here in the sinkhole. Deer tongue fern is under nature protection.

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Nearby routes

Best routes near Hart's-tongue fern sinkhole in Hainholz

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1. Karst Trail and View of Düna – Jetten Cave loop from Gipskarstlandschaft Hainholz

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2. Jetten Cave – Hainholz Gypsum Karst Landscape loop from Gipskarstlandschaft Hainholz

8.80km

02:26

160m

150m

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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3. Hainholz Gypsum Karst Landscape – Karst Trail and View of Düna loop from Gipskarstlandschaft Hainholz

12.1km

03:25

260m

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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Informations

Elevation 270 m

Weather

Tuesday 10 March

13°C

6°C

82 %

Additional weather tips

Max wind speed: 17.0 km/h

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Location: Osterode, Osterode am Harz, Harz Mountains, Saxony-Anhalt, Germany

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Hart's-tongue fern sinkhole in Hainholz

1. Karst Trail and View of Düna – Jetten Cave loop from Gipskarstlandschaft Hainholz

2. Jetten Cave – Hainholz Gypsum Karst Landscape loop from Gipskarstlandschaft Hainholz

3. Hainholz Gypsum Karst Landscape – Karst Trail and View of Düna loop from Gipskarstlandschaft Hainholz

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