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Planina Cave ((スロベニア語:Planinska jama)), formerly also Little Castle Cave () after Little Castle in the vicinity of it entrance, is one of the longest Slovenian water caves. It is a huge tunnel and the subterranean bed of the Unica River. It is located in Inner Carniola. Five hundred meters from the entrance into the cave is a confluence of two underground rivers: the Pivka River, flowing from the Postojna Polje through Postojna Cave, and the Rak River, flowing from Rak Škocjan. This is one of the largest confluences of subterranean rivers in Europe. Entrance into the cave is at the southwestern part of Planina Polje in the gable end valley below 65 high rocks. The length of the cave is . It has been shown by water tracing that there is a connection between the systems of Planina Cave and Postojna Cave, and the administration of Postojna Cave estimates the connection will also be explored by cavers. The length of the joint system would be over . ==Geographical data== *latitude: 45°49'12" N (WGS 84) *longitude: 14°14'45" E *elevation: *length of the cave: *subterranean depth: 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Planina Cave」の詳細全文を読む スポンサード リンク
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