Postojna Cave (Slovene: Postojnska jama; German: Adelsberger Grotte; Italian: Grotte di Postumia) is a 20570 m long karst cave system near Postojna Slovenia. It is the second-longest cave system in the country (following the Migovec Cave System) as well as one of its top tourism sites. The caves were created by the Pivka River.
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