ナショナルジオグラフィックのインスタグラム(natgeo) - 12月15日 12時34分

Photo by Robbie Shone @shonephoto / Postojna jama (cave) is 24,340 meters (about 15 miles) long, the second longest cave system in Slovenia as well as one of its top tourism sights. The caves were created by the Pivka River, a subterranean river.

[BIHAKUEN]UVシールド(UVShield)

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