Danube Sinkhole
sinkholes seeping water from the Danube for about half the year, and transferring a part of them to the Aachtopf
en-US/ˈdænjub ˈsɪŋˌkhoʊl/
sinkholes seeping water from the Danube for about half the year, and transferring a part of them to the Aachtopf