Aggertalhöhle - Ründerother Höhle

Agger Valley Cave - Cave of Ründeroth

Useful Information

Location: A4 exit Engelskirchen, 1 km W Ründeroth, on the right shore of river Agger.
Open: 15-MAR to 01-NOV Thu-Sun, Hol 10-17. [2006]
Fee: Adults EUR 3, Children (3-15) EUR 2, Students EUR 2.
Groups (10+): Adults EUR 2.50, Children (3-15) EUR 1.50, Students EUR 1.50.
Classification: SpeleologyKarst cave cave system, lower middle Devon (reef limestone)
Light: LightIncandescent Electric Light System
Dimension: L=1,070 m, BC: H=18 m.
Guided tours: L=260 m, D=45 min.
Bibliography: Die Aggertalhöhle in Ründeroth, Gemeinde Engelskirchen, Oberbergischer Kreis, Hrsg: Verkehrsamt der Gemeinde Engelskirchen, 1983
Address: Servicebüro Aggertalhöhle Ründeroth, Dr. Sylvia-Kathrin Tanneberger, Kaltenbacher Straße 2, 51766 Engelskirchen-Bellingroth, E-mail: contact
Aggertalhöhle, Im Krümmel, 51766 Engelskirchen, Tel: +49-2263-70702 (cave, answering machine)

Kulturamt der Gemeinde Engelskirchen, im Rathaus, 51766 Engelskirchen/Ründeroth, Tel: +49-2263-83-137
As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
Please check rates and details directly with the companies in question if you need more recent info.


1773 mentioned as year of discovery in old documents.
1819 a Feckelsberger Höhle first noticed. Very likely the Aggertalhöhle.
1890 tunnel into the cave built.
1910 first cave map by Wolf.
1927 start of development with pathes and electric light.
12-OCT-1930 inauguration.
1945 used as air raid shelter.
1948 reopened.
1950 renamed Aggertalhöhle by the Gemeinderat (municipal council).
1952 tunnel redone with concrete.
1960 cave map by Holz.
1995 cave run by the Arbeitskreis Kluterthöhle e.V..


The Aggertalhöhle ist a very dry cave. A layer of clay is sealing the cave from water above, so there is no dripping water and obviously no dripstones. Only after heavy rains, the water enters the lower part of the cave and floods them.

On several locations the cave has nice speleothems of aragonite. Brushes of fine needles, only a few millimeters long, sit on the walls. Other speleothems are a few small sinter formations, also consisting of aragonite. The reason why the speleothems are aragonite and not calcite is the high amount of Magnesia (Mg) in the dolomitic limestone.

Very interesting are the fossils in the limestone, a tropic reef complex is fossilized and the various petrified lifeforms are brought out by erosion. On a walk through the cave the visitor sees various regions of the reef, the outside with corral blocks destroyed by the surf, and fine grained sediments of the lagoon.

Only a relatively small area around the cave is built of limestone and karstified. The surroundings constist of greywacke and and schist, the limestone is the center of a saddle. The karst area was declared a natural monument with a size of about 50 hectares. It shows several other karst features, despite the cave. There are eight more caves known in the area and there are several karst springs and sinks.

Only 40 m from the entrance to the Aggertal cave, the Walbach flows. This brook drains the area, it is a tributary to the Agger river. Around the cave Walbach shows several interesting feature. It is higher than the cave, but there seems to be no connection, as the water does not enter the cave. But there are several sinks in the bed of the brook, which sre connected to nearby springs. The detailed hydrologic situation was explored with dyeing experiments.