ナショナルジオグラフィックのインスタグラム(natgeo) - 1月2日 18時31分

Photo by @shonephoto (Robbie Shone) - Zelske jama (cave) lies at the base of several natural rock bridges in the Rakov Škocjan region in Slovenia. In the background of this photograph, two explorers cross the floor of one of the skylights where, long ago the cave roof collapsed and now the evening sky and stars can be seen. This beautiful arched entrance portal has been formed over hundreds of thousands of years by constant erosion from the River Rak.
This is the last image from a portfolio of photographs shot for @NatGeoAdventure from the famous river caves of Slovenia, birth place of speleology and home to the 'human fish'. With my caving colleagues I visited 8 caves, each one varied and different with its own personality. @natgeocreative

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