Molnár János Cave

The Molnár János Cave is a thermokarstic water-filled cave system. It is located in the Rózsadomb district of Budapest in Hungary. The deepest sections reach 100 metres (330 ft), while the total length of explored sections is currently 5.5 kilometres (3.4 mi). The cave mouth is just 200 metres (660 ft) from the Danube. In 2008, a cave lake was found there, with largest chamber roughly 86 metres (282 ft) long, 27 metres (89 ft) wide and 15 metres (49 ft) high.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).