National Geographic Travelのインスタグラム(natgeotravel) - 12月21日 17時38分

Photo by @shonephoto (Robbie Shone) - Zelske jama (cave) lies at the base of several natural rock bridges in the Rakov Škocjan region valley in Slovenia. In the background of this photograph, two explorers cross a small rock bridge and enter the cave. This beautiful arched entrance portal has been formed over hundreds of thousands of years by constant erosion from the River Rak.
This portfolio of photographs was 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.
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