Juan Carlos Munoz / European beech forest (Fagus sylvatica) in autumn, view from below in the mist, Ilirska Bistrica, Green Karst, Slovenia, October.
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Juan Carlos Munoz / People exploring underground lakes via rigid inflatable boat, Cross Cave (Krizna jama) under Cross Mountain, Green Karst, Slovenia, October 2014.
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Juan Carlos Munoz / Tourists looking down onto underground stream, from illuminated pathway, Skocjan Caves, Green Karst, Slovenia, October 2014.
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Michel Roggo / Karst spring where water bubbles up from subterranean source, Julian Alps, Slovenia, June 2008
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Angelo Gandolfi / Secluded cove amongst karstic rocks on the Green Coast, Cantabria, Spain. Picos de Europa mountains in the distance. July 2008.
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Robert Valentic / Chinese water dragon (Physignathus cocincinus) male from a small stream flowing through karst rainforest within the Phong Nha-Ke Bang National Park, central Vietnam. Dry season.
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Michel Roggo / Piccaninnie Ponds Creek (or Ellards Creek) flowing out of the spring-fed limestone ponds at the Piccaninnie Ponds Conservation Park South Australia, Australia March 2015 . Photographed for The Freshwa...
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Michel Roggo / Piccaninnie Ponds with The Chasm, a weakness in the limestone eroded by the rising water, with a depth of over 100 meters. Spring-fed limestone ponds at the Piccaninnie Ponds Conservation Park South A...
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Michel Roggo / Piccaninnie Ponds With The Chasm, a weakness in the limestone eroded by the rising water, with a depth of over 100 meters. Spring-fed limestone ponds at the Piccaninnie Ponds Conservation Park The cla...
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Michel Roggo / Piccaninnie Ponds with The Chasm, a weakness in the limestone eroded by the rising water, with a depth of over 100 meters. Spring-fed limestone ponds at the Piccaninnie Ponds Conservation Park South A...
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Michel Roggo / Piccaninnie Ponds with The Chasm, a weakness in the limestone eroded by the rising water, with a depth of over 100 meters. Spring-fed limestone ponds at the Piccaninnie Ponds Conservation Park South A...
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Michel Roggo / Underwater view of Ewens Ponds, spring-fed limestone ponds, Ewens Ponds Conservation Park, South Australia, Australia, March 2015 . Photographed for The Freshwater Project
