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

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

Franco Banfi / Tench (Tinca tinca) amongst reeds, Sion, Valais canton, southwestern Switzerland

Franco Banfi / Tench (Tinca tinca) ) digs for food on the bottom, Sion, Valais canton, southwestern Switzerland

Franco Banfi / Northern pike (Esox lucius), Sion, Valais canton, southwestern Switzerland, Europe

Franco Banfi / Northern pike (Esox lucius) large individual, Sion, Valais canton, southwestern Switzerland, Europe

Franco Banfi / Tench (Tinca tinca) during spawning period amongst European watermilfoil (Myriophyllum spicatum), Sion, Valais canton, southwestern Switzerland

Franco Banfi / Tench (Tinca tinca) during spawning period amongst European watermilfoil (Myriophyllum spicatum), Sion, Valais canton, southwestern Switzerland

Franco Banfi / Northern pike (Esox lucius) amongst Shining pondweed (Potamogeton lucens), Sion, Valais canton, southwestern Switzerland, Europe

Franco Banfi / Northern pike (Esox lucius) amongst Shining pondweed (Potamogeton lucens), Sion, Valais canton, southwestern Switzerland, Europe

Franco Banfi / Northern pike (Esox lucius) amongst Shining pondweed (Potamogeton lucens), Sion, Valais canton, southwestern Switzerland, Europe

Franco Banfi / Northern pike (Esox lucius) amongst Shining pondweed (Potamogeton lucens), Sion, Valais canton, southwestern Switzerland, Europe

Franco Banfi / Northern pike (Esox lucius) amongst Europe Watermilfoil (Myriophyllum spicatum), Sion, Valais canton, southwestern Switzerland

Franco Banfi / Tench (Tinca tinca), Sion, Valais canton, southwestern Switzerland

Franco Banfi / Tench (Tinca tinca) during spawning period amongst European watermilfoil (Myriophyllum spicatum), Sion, Valais canton, southwestern Switzerland

Franco Banfi / Northern pike (Esox lucius) amongst Europe Watermilfoil (Myriophyllum spicatum), Sion, Valais canton, southwestern Switzerland

Franco Banfi / Tench (Tinca tinca) amongst European watermilfoil (Myriophyllum spicatum), Sion, Valais canton, southwestern Switzerland

Franco Banfi / European watermilfoil (Myriophyllum spicatum), Sion, Valais canton, southwestern Switzerland

Franco Banfi / Pondweed (Potamogeton lucens), Sion, Valais canton, southwestern Switzerland, Europe

Franco Banfi / Tench (Tinca tinca), Sion, Valais canton, southwestern Switzerland

Franco Banfi / Tench (Tinca tinca), Sion, Valais canton, southwestern Switzerland

Graham Eaton / Cottongrass (Eriophorum sp) flowering beside Riffelsee, Matterhorn reflected in lake. Zermatt, Valais, Switzerland. September 2019.

Graham Eaton / Lateral moraine deposit at edge of Findel Glacier. Glacier in retreat with braided stream below. Zermatt, Valais, Switzerland. September 2019.

Graham Eaton / Gorner Glacier below Monte Rosa. Zermatt, Valais, Switzerland. September 2019.

Graham Eaton / Medial moraine between two glaciers, the slight difference in speed of the glaciers results in curved drag patterns in the ice, aerial view. Lower Theodul Glacier, Zermatt, Valais, Switzerland. Septem...

Graham Eaton / Lateral moraine deposited at edge of Findel glacier. Glacier in retreat with braided river in valley, Matterhorn in distance. Zermatt, Valais, Switzerland. September 2019.

Graham Eaton / Gorner Glacier with medial moraine formed when two glaciers and their lateral moraines merge into one. View from the Gornergrat Hotel, Zermatt, Valais, Switzerland. September 2019.

Graham Eaton / Gorner Glacier amongst Monte Rosa, Breithorn and Pollux mountains. Zermatt, Valais, Switzerland. September 2019.

Graham Eaton / Glacial striations on rock near snout of Findel Glacier, created by abrasion at base of glacier when rocks are dragged over the bedrock. Zermatt, Valais, Switzerland. September 2019.

Graham Eaton / Fluhalp Hotel in the alps, Findel glacier in background. Zermatt, Valais, Switzerland. September 2019.

Graham Eaton / Glacial erratic at the side of track in mountains. Zermatt, Valais, Switzerland. September 2019.

Graham Eaton / Snow covered peak of Breithorn, at 4159m. Near Zermatt, Valais, Switzerland. September 2019.

Graham Eaton / Snow covered peak of Breithorn at 4159m, viewed from Klein Matterhorn. Near Zermatt, Valais, Switzerland. September 2019.

Loic Poidevin / Lac du col grand Saint Bernard, Versant Italien, Valais, Switzerland, September.

Loic Poidevin / Hikers with St.Bernard rescue dogs near Lac du Grand Saint Bernard, Valais, Switzerland, September 2018.

Loic Poidevin / Hikers with St.Bernard rescue dogs near Lac du Grand Saint Bernard, Valais, Switzerland, September 2018.

Loic Poidevin / Tour Bayart Castle, Saillon, Valais, Switzerland, September 2018.

Loic Poidevin / Church in Ayer village, Valais,Switzerland,September

Loic Poidevin / Monkshood (Aconitum napellus) in flower in mountain, Valais, Switzerland, September

Loic Poidevin / Pyramides d'Euseigne, Val d'Herens, Valais,Switzerland, September.

Loic Poidevin / Pyramides d'Euseigne, Val d'Herens, Valais,Switzerland, September.

Loic Poidevin / Matterhorn at Zermatt, Valais,Switzerland, September 2018.

Loic Poidevin / Man leading cow with large cowbell and headdress during Des Alpes des Vaches Parade, Ayer, Valais,Switzerland,September

Loic Poidevin / Man leading cow with large cowbell and headdress during Des Alpes des Vaches Parade, Ayer, Valais,Switzerland,September

Loic Poidevin / Cows walking down street during Des Alpes des Vaches Parade, Ayer, Valais, Switzerland, September

Michel Roggo / Grayling (Thymallus thymallus) at spawning ground in a small tributary of the Lac de Fenetre, an alpine lake, 2456 m above sea level, Canton of Valais, Switzerland. June 2011. Photographed for The Fr...

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

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