Nature Picture Library Europe Alpenwasser, Switzerland

Lac de Fenetre alpine lake, still under ice cover at the end of May, 2456 m above sea level, Canton of Valais, Switzerland, May. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Lac de Fenetre alpine lake, still under ice cover at the end of May, 2456 m above sea level, Canton of Valais, Switzerland, May. Taken for the Freshwater Project.

Lac de Fenetre, alpine lake, underwater view of ice covering the lake above, taken at 2456 m above sea level, Canton of Valais, Switzerland, June 2012. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Lac de Fenetre, alpine lake, underwater view of ice covering the lake above, taken at 2456 m above sea level, Canton of Valais, Switzerland, June 2012. Taken for the Freshwater Project.

Grayling (Thymallus thymallus) on spawning ground. Lac de Fenetre, alpine lake, 2456 m above sea level, Canton of Valais, Switzerland, June. - Michel Roggo

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Michel Roggo / Grayling (Thymallus thymallus) on spawning ground. Lac de Fenetre, alpine lake, 2456 m above sea level, Canton of Valais, Switzerland, June.

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Michel Roggo / Grayling (Thymallus thymallus) on spawning ground. Lac de Fenetre, alpine lake, 2456 m above sea level, Canton of Valais, Switzerland, June.

Underwater view of ice in Lac de Fenetre, alpine lake, 2456 m above sea level, Canton of Valais, Switzerland. June. 2012. Photographed for The Freshwater Project - Michel Roggo

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Michel Roggo / Underwater view of ice in Lac de Fenetre, alpine lake, 2456 m above sea level, Canton of Valais, Switzerland. June. 2012. Photographed for The Freshwater Project

Lac de Fenetre alpine lake, still under ice cover at the end of May, 2456 m above sea level, Canton of Valais, Switzerland, May 2012. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Lac de Fenetre alpine lake, still under ice cover at the end of May, 2456 m above sea level, Canton of Valais, Switzerland, May 2012. Taken for the Freshwater Project.

Lac de Fenetre, alpine lake, 2456 m above sea level, Canton of Valais, Switzerland. June 2011. Photographed for The Freshwater Project. - Michel Roggo

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Michel Roggo / Lac de Fenetre, alpine lake, 2456 m above sea level, Canton of Valais, Switzerland. June 2011. Photographed for The Freshwater Project.

Lac de Fenetre, alpine lake, underwater view with bloom of thick algae, Canton of Valais, Switzerland, May. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Lac de Fenetre, alpine lake, underwater view with bloom of thick algae, Canton of Valais, Switzerland, May. Taken for the Freshwater Project.

Lac de Fenetre, alpine lake, still under an ice cover at the end of May, 2456 m above sea level, Canton of Valais, Switzerland. May 2012. Photographed for The Freshwater Project - Michel Roggo

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Michel Roggo / Lac de Fenetre, alpine lake, still under an ice cover at the end of May, 2456 m above sea level, Canton of Valais, Switzerland. May 2012. Photographed for The Freshwater Project

Split level view of blue green waters of Verzasca River flowing over granite rocks at Lavertezzo, Canton Tessin, Switzerland, September. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Split level view of blue green waters of Verzasca River flowing over granite rocks at Lavertezzo, Canton Tessin, Switzerland, September. Taken for the Freshwater Project.

Underwater landscape in Verzasca River, Ticino, Switzerland, September - Michel Roggo

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Michel Roggo / Underwater landscape in Verzasca River, Ticino, Switzerland, September

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Michel Roggo / Underwater landscape in Verzasca River, Ticino, Switzerland, September

Underwater landscape of Verzasca River with granite rocks, at Lavertezzo, Canton Tessin, Switzerland, September 2011. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Underwater landscape of Verzasca River with granite rocks, at Lavertezzo, Canton Tessin, Switzerland, September 2011. Taken for the Freshwater Project.

Verzasca River, Lavertezzo, Canton Tessin, Switzerland. February. Photographed for The Freshwater Project - Michel Roggo

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Michel Roggo / Verzasca River, Lavertezzo, Canton Tessin, Switzerland. February. Photographed for The Freshwater Project

Waterfall in the Verzasca River, Canton Tessin, Switzerland, November. Photographed for The Freshwater Project. - Michel Roggo

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Michel Roggo / Waterfall in the Verzasca River, Canton Tessin, Switzerland, November. Photographed for The Freshwater Project.

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Michel Roggo / Underwater landscape in Verzasca River, Ticino, Switzerland, September

Gorner Glacier with meltwater channels, and the Matterhorn in the background, Valais Alps, Canton Valais / Wallis, Switzerland 20-08-2013 . Photographed for The Freshwater Project - Michel Roggo

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Michel Roggo / Gorner Glacier with meltwater channels, and the Matterhorn in the background, Valais Alps, Canton Valais / Wallis, Switzerland 20-08-2013 . Photographed for The Freshwater Project

Underwater landscape in Verzasca River, Ticino, Switzerland, February - Michel Roggo

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Michel Roggo / Underwater landscape in Verzasca River, Ticino, Switzerland, February

Snow covered rocks in the Verzasca River, Lavertezzo area, Canton Tessin, Switzerland , February. Photographed for the Freshwater Project. - Michel Roggo

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Michel Roggo / Snow covered rocks in the Verzasca River, Lavertezzo area, Canton Tessin, Switzerland , February. Photographed for the Freshwater Project.

Underwater view of leaves floating in the Verzasca River, at Lavertezzo, Canton Tessin, Switzerland, October 2011. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Underwater view of leaves floating in the Verzasca River, at Lavertezzo, Canton Tessin, Switzerland, October 2011. Taken for the Freshwater Project.

Landscape of the Verzasca River in autumn, Canton Tessin, Switzerland, November 2011. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Landscape of the Verzasca River in autumn, Canton Tessin, Switzerland, November 2011. Taken for the Freshwater Project.

Underwater landscape in Verzasca river, with Brown trout in turbulent water, Ticino, Switzerland, February - Michel Roggo

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Michel Roggo / Underwater landscape in Verzasca river, with Brown trout in turbulent water, Ticino, Switzerland, February

Underwater landscape of granite rocks in the Verzasca River, at Lavertezzo, Canton Tessin, Switzerland, September 2011. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Underwater landscape of granite rocks in the Verzasca River, at Lavertezzo, Canton Tessin, Switzerland, September 2011. Taken for the Freshwater Project.

Rocky granite underwater landscape in the Verzasca River, Tessin, Switzerland, September 2010. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Rocky granite underwater landscape in the Verzasca River, Tessin, Switzerland, September 2010. Taken for the Freshwater Project.

Underwater view of rocks and rippled sunlight in the Verzasca River, Lavertezzo area, Canton Tessin, Switzerland. September. Photographed for the Freshwater Project. - Michel Roggo

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Michel Roggo / Underwater view of rocks and rippled sunlight in the Verzasca River, Lavertezzo area, Canton Tessin, Switzerland. September. Photographed for the Freshwater Project.

Gorner Glacier with meltwater channels, Valais Alps, Canton Valais / Wallis, Switzerland. August. Photographed for The Freshwater Project - Michel Roggo

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Michel Roggo / Gorner Glacier with meltwater channels, Valais Alps, Canton Valais / Wallis, Switzerland. August. Photographed for The Freshwater Project

Underwater in a cryoconite hole, a hole formed by windblown dust and particles which warm up ice of glacier and creates meltwater holes. Gorner Glacier, Valais Alps, Canton Valais / Wallis, Switzerlan... - Michel Roggo

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Michel Roggo / Underwater in a cryoconite hole, a hole formed by windblown dust and particles which warm up ice of glacier and creates meltwater holes. Gorner Glacier, Valais Alps, Canton Valais / Wallis, Switzerlan...

Gorner Glacier with fissures and eroded rocky ground, Valais Alps, Canton Valais / Wallis, Switzerland, August. Photographed for The Freshwater Project - Michel Roggo

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Michel Roggo / Gorner Glacier with fissures and eroded rocky ground, Valais Alps, Canton Valais / Wallis, Switzerland, August. Photographed for The Freshwater Project

Meltwater lakes and the Matterhorn in the background, Gornerglacier or Gornergletscher, with Valais Alps, Canton Valais / Wallis, Switzerland, August 2013. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Meltwater lakes and the Matterhorn in the background, Gornerglacier or Gornergletscher, with Valais Alps, Canton Valais / Wallis, Switzerland, August 2013. Taken for the Freshwater Project.

Meltwater at the terminus of the Gorner Glacier Valais Alps, Canton Valais / Wallis, Switzerland. August 2013. Photographed for The Freshwater Project - Michel Roggo

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Michel Roggo / Meltwater at the terminus of the Gorner Glacier Valais Alps, Canton Valais / Wallis, Switzerland. August 2013. Photographed for The Freshwater Project

Gorner Glacier with meltwater channels, and Breithorn, Valais Alps, Canton Valais / Wallis, Switzerland, August 2013. Stitched panorama. Photographed for The Freshwater Project - Michel Roggo

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Michel Roggo / Gorner Glacier with meltwater channels, and Breithorn, Valais Alps, Canton Valais / Wallis, Switzerland, August 2013. Stitched panorama. Photographed for The Freshwater Project

Photographer Michel Roggo at work at the Gornerglacier / Gornergletscher, Valais Alps, Canton Valais / Wallis, Switzerland, August 2013. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Photographer Michel Roggo at work at the Gornerglacier / Gornergletscher, Valais Alps, Canton Valais / Wallis, Switzerland, August 2013. Taken for the Freshwater Project.

Gorner Glacier with meltwater channels, from Gornergrat, Valais Alps, Canton Valais / Wallis, Switzerland. April 2013. Photographed for The Freshwater Project - Michel Roggo

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Michel Roggo / Gorner Glacier with meltwater channels, from Gornergrat, Valais Alps, Canton Valais / Wallis, Switzerland. April 2013. Photographed for The Freshwater Project

Patterns of the Gornerglacier or Gornergletscher, with meltwater channels, from Gornergrat, Valais Alps, Canton Valais/Wallis, Switzerland, April 2013. Taken for the Freshwater Project. - Michel Roggo

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Michel Roggo / Patterns of the Gornerglacier or Gornergletscher, with meltwater channels, from Gornergrat, Valais Alps, Canton Valais/Wallis, Switzerland, April 2013. Taken for the Freshwater Project.

Underwater view of cryoconite hole, a hole formed by windblown dust and particles which warm up ice of glacier and creates meltwater holes. Gorner Glacier, Valais Alps, Canton Valais / Wallis, Switzer... - Michel Roggo

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Michel Roggo / Underwater view of cryoconite hole, a hole formed by windblown dust and particles which warm up ice of glacier and creates meltwater holes. Gorner Glacier, Valais Alps, Canton Valais / Wallis, Switzer...

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Underwater landscape with turbulence around rocks in shallow water, Verzasca river, Ticino, Switzerland, November - Michel Roggo

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Michel Roggo / Underwater landscape with turbulence around rocks in shallow water, Verzasca river, Ticino, Switzerland, November

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Meltwater channel, with cryoconite on the ground, on the surface of the Gornerglacier or Gornergletscher Valais Alps, Canton Valais/Wallis, Switzerland.03-09-2013.Photographed for The Freshwater Proje... - Michel Roggo

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Michel Roggo / Meltwater channel, with cryoconite on the ground, on the surface of the Gornerglacier or Gornergletscher Valais Alps, Canton Valais/Wallis, Switzerland.03-09-2013.Photographed for The Freshwater Proje...