Dolinen

At least four neighboring sinkholes have grown together here to Karstsenken (Uvalas). Several hundred meters below, the subterranean Danube water, which has infiltrated Immendingen, flows to the Aach spring.

There are several on the Dornsberg, especially but two huge collapse craters (sinkholes) the size of a football field with Jurassic limestone that is clearly visible on the walls. Their formation is seen in connection with karstification and liming solution on the pot.

There is cave excavation work to get you into the Aach cave without diving.

Two approx. 20 m deep sinkholes with diameters over 40 m are sunk into the layers of rough limestone within the cement marl formation (formerly Weißjura zeta 2); the limestones are clearly visible on the walls of the sinkholes. Their formation is probably related to the karstification and lime dissolution by the karst waters that emerge at the Aachtopf. A group of cave explorers succeeded a few years ago - starting from one of the two sinkholes - with a 105 m deep shaft to work their way to the underground karst waters.

Two huge sinkholes with information boards, here you get an idea of the size and extent of the caves

what a sinkhole should look like