ナショナルジオグラフィックのインスタグラム(natgeo) - 12月7日 00時37分

Photo by Robbie Shone @shonephoto / Postojna jama (cave) is a 24,340-meter-long karst cave system near Postojna, in southwestern Slovenia. It is the second longest system in the country as well as one of its top tourism sights. The caves were created by the Pivka River. Here, Pivka and the Black jama are the final two caves along the subterranean river before it disappears and resurfaces in the Planina jama.

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